THORLABS MX10C User manual

MX10C Series
12.5 Gb/s Optical Transmitters
MX40C Series
40 Gb/s Optical Transmitters
User Guide

MX10C, MX40C Series of Optical Transmitters
Table of Contents
Chapter 1 Introduction ..............................................................................................................................................................1
1.1 Description.....................................................................................................................................................1
1.2 Parts List ........................................................................................................................................................1
1.3 Block Diagram................................................................................................................................................2
1.4 Front and Back Panel Overview...................................................................................................................3
Chapter 2 Safety.........................................................................................................................................................................5
2.1 Precautions....................................................................................................................................................6
Chapter 3 Quick Start Guide.....................................................................................................................................................7
3.1 Hardware Set Up............................................................................................................................................7
3.2 Controls on the Home Page..........................................................................................................................8
3.3 System Wavelength Setting..........................................................................................................................9
3.4 Controls on the Settings Pages..................................................................................................................10
3.5 Quick Start ...................................................................................................................................................11
Chapter 4 Operating Instructions...........................................................................................................................................12
4.1 Control Loop Diagram.................................................................................................................................12
4.2 Amplifier Settings Page ..............................................................................................................................12
4.3 Variable Optical Attenuator Settings Page................................................................................................15
4.4 Laser Settings Page ....................................................................................................................................16
4.5 Load Page ....................................................................................................................................................18
4.6 Menu Page....................................................................................................................................................19
4.6.1 Display and Sound Settings Page.....................................................................................................19
4.6.2 System Information Page..................................................................................................................20
4.6.3 Accent LED Settings Page................................................................................................................20
4.6.4 Thorlabs Help Page ..........................................................................................................................21
Chapter 5 Specifications.........................................................................................................................................................22
5.1 General System Specifications ..................................................................................................................22
5.2 Power and Environmental Specifications .................................................................................................23
5.3 Internal Control Specifications...................................................................................................................23
5.4 Internal Amplifier Specifications................................................................................................................23
5.5 Internal Modulator Specifications..............................................................................................................23
5.6 Laser Specifications....................................................................................................................................24
Chapter 6 Control and PC Connections.................................................................................................................................25
6.1 General Purpose I/O, RS-232, and USB Connections...............................................................................25
6.2 The Laser Safety Interlock..........................................................................................................................26
Chapter 7 Mechanical Drawings.............................................................................................................................................27
7.1 MX10C Series...............................................................................................................................................27
7.2 MX40C Series...............................................................................................................................................28
Chapter 8 Maintenance, Repair, and Fuses...........................................................................................................................29
8.1 Maintenance and Repair .............................................................................................................................29
8.2 Replacement Parts ......................................................................................................................................29

MX10C, MX40C Series of Optical Transmitters
8.3 Replacing the Main Fuse.............................................................................................................................30
Chapter 9 Troubleshooting.....................................................................................................................................................31
Chapter 10 Declarations of Conformity.........................................................................................................................32
Chapter 11 Thorlabs Worldwide Contacts....................................................................................................................34

MX10C, MX40C Series of Optical Transmitters Chapter 1: Introduction
Rev. F, February 21, 2020 Page 1
Chapter 1 Introduction
1.1 Description
Thorlabs' MX10C and MX40C series of optical transmitters with phase modulators are designed for high-speed phase
modulation of light. They are fully-integrated and user-configurable solutions based on proven lithium niobate (LiNbO3) modulator
technology driven by high-fidelity digital RF amplifiers. They are designed for digital applications, and the maximum output swing
of their limiting RF amplifiers is user-adjustable. Variable optical attenuators (VOAs) and power monitors enable completely
automatic optical output power control and stabilization. The MX10C series includes an external loop-back cable for the driver
RF output and modulator RF input ports, which provides the opportunity to use an external driver, if desired.
The MX10C/MX40C, MX10C-LB/MX40C-LB, and MX10C-1310/MX40C-1310 include a tunable C-band laser, a tunable L-band
laser, and a 1310 nm fixed-wavelength laser, respectively. Both the C- and L-band laser sources are tunable on the ITU 50 GHz
grid and include a dither feature for wavelength stabilization. An external laser source, operating from 1250 nm to 1610 nm, can
also be used with all models to provide the optical input.
These instruments can be controlled in two ways. The simplest method is directly via the built-in graphical user interface (GUI)
and touchscreen. The instrument can also be operated remotely via the RS-232 or USB ports on the back panel. Remote control
is enabled using simple SCPI-type serial commands from a PC. See the remote control user guide (RCUG), which can be
downloaded from https://www.thorlabs.com/manuals.cfm.
The most recent firmware and remote control software tools can be downloaded by visiting
https://www.thorlabs.com/navigation.cfm?Guide_ID=2191 and entering the Item # into the search field. Thorlabs’ technical
support can provide up-to-date information on available firmware revisions and control functions.
NOTE: This manual covers both the MX10C and MX40C series of models as the architectures are very similar. Any differences
will be clearly noted in the following sections.
1.2 Parts List
Inspect the shipping container for damage. If the shipping container seems to be damaged, keep it until you have inspected the
contents and tested the unit mechanically and electrically. Verify that you have received the following items within the package:
1. MX10C or MX40C Series Optical Transmitter Main Unit
2. Power Cord According to Local Power Supply
3. PM Loopback Fiber Optic Cable
4. SMA Loopback RF Cable (not required for MX40C series)
5. Interlock Keys
6. 2.5 mm Interlock Pin (in back panel)
7. 1.25 A 250 VAC Fuse
8. USB Type A to Type B Cable, 6' Long

MX10C, MX40C Series of Optical Transmitters Chapter 1: Introduction
Page 2 TTN048898-D02
1.3 Block Diagram
These instruments are fully integrated and contain both the laser source and a high-speed phase modulator. All the user needs
to supply is the signal source to the Amplifier RF In port. The user can choose to use the internal laser source (via loop-back
fiber) or an external laser source of their own. The Laser In port uses PM fiber with light linearly polarized along the slow axis as
shown on the front panel. Maximum input power is 20 dBm (100 mW). In the MX10C series, the user also has the option of using
their own modulator driver connected to the Modulator RF In port. Transmitters in the MX40C series does not have this option
in order to preserve signal integrity. Optical power is monitored in three places (Mon-1, -2, -3) for the purpose of enabling bias
and power control. These power values are also available at the I/O port. Mon-1 is at the Laser Input, Mon-2 is at the modulator
output, and Mon-3 is at the final Optical Output.
Figure 1 Block Diagram of the MX10C and MX40C Series

MX10C, MX40C Series of Optical Transmitters Chapter 1: Introduction
Rev. F, February 21, 2020 Page 3
1.4 Front and Back Panel Overview
Figure 2 Front Panel
Callout
Description
MX10C Series
MX40C Series
A
Touchscreen Display
-
-
B
Adjustment Knob
-
-
C
Key Switch and Indicator
Lasing Disabled; Lasing
Enabled
-
-
D
Grounding Jack (Banana
Connector)
Earth Ground
Banana
Banana
E
Laser Output
PM FC/PC
PM FC/PC
F
Laser Input
PM FC/PC
PM FC/PC
G
Optical Output
FC/PC
FC/PC
H
Amplifier RF Output
SMA
Not Available
J
Modulator RF Input
SMA
Not Available
K
Amplifier RF Input
SMA
2.92 mm
L
Standby Button
-
-
C
D
A
B
L
K
J
H
G
F
E

MX10C, MX40C Series of Optical Transmitters Chapter 1: Introduction
Page 4 TTN048898-D02
Figure 3 Back Panel
Callout
Description
MX10C Series
MX40C Series
M
I/O Port
DB-15
DB-15
N
Option Label
-
-
O
RS-232 Port
DB-9
DB-9
P
USB Port, Type B
-
-
Q
Laser Interlock
2.5 mm
2.5 mm
R
Power Connector
-
-
S
Fuse Tray
-
-
T
Power Switch
Supply On; Supply Off
-
-
P
O
N
M
T
Q
S
R

MX10C, MX40C Series of Optical Transmitters Chapter 2: Safety
Rev. F, February 21, 2020 Page 5
Chapter 2 Safety
All statements regarding safety of operation and technical data in this instruction manual will only apply when the unit is operated
correctly. If equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired. Only with written consent from Thorlabs maychanges to single components becarried out or components not supplied
by Thorlabs be used.
Warning: Risk of Electrical Shock
Before applying power to the instrument, make sure that the protective conductor of the 3 conductor mains power
cord is correctly connected to the protective earth contact of the socket outlet. Improper grounding can cause electric
shock with damage to your health or even death. The local supply voltage must be in the range specified on the back
panel, and the correct fuse must be installed in the fuse holder. If not, please replace the main fuse (see section on
instrument maintenance). Only use mains cable with sufficient current and voltage ratings for this instrument. Do not
position equipment in a way that makes it difficult for the user to operate the disconnecting device. Do not remove
covers. Refer servicing to qualified personnel.
Warning: Risk of Explosion
The instrument must not be operated in explosion endangered environments.
Warning: Laser Radiation
Avoid Exposure –Radiation emitted from apertures. Do not look into the laser
aperture while the laser is on. Injury to the eye may result. Laser should not be turned
on unless there is an optical fiber connected to the laser output port.
Caution –Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
Caution: ESD Sensitive Component
The components inside this instrument are ESD sensitive. Take all appropriate precautions to discharge personnel
and equipment before making any connections to the unit. A front panel grounding jack is provided for connection to
a wrist strap.
Caution: Components not Water Resistant
This instrument should be kept clear of environments where liquid spills or condensing moisture are likely. It is not
water resistant. To avoid damage to the instrument, do not expose it to spray, liquids, or solvents.
Caution: Follow Intended Usage Guidelines
This product is not suitable for household room illumination.
Inputs and outputs must only be connected with shielded connection cables.
Do not obstruct the air ventilation slots in housing.
Mobile telephones, cellular phones or other radio transmitters are not to be used within the range of three meters of
this unit since the electromagnetic field intensity maythen exceed the maximum allowed disturbance values according
to IEC 61326-1.

MX10C, MX40C Series of Optical Transmitters Chapter 2: Safety
Page 6 TTN048898-D02
2.1 Precautions
The following statement applies to the products covered in this manual, unless otherwise specified herein. The statement for
other products will appear in the accompanying documentation.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules and meets all requirements of the Canadian Interference Causing Equipment Standard ICES-003 for digital
apparatus. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not
occur in a particular installation.
This product has been tested and found to comply with the limits according to IEC 61326-1 for using connection cables shorter
than 3 meters (9.8 feet).
Thorlabs is not responsible for any radio television interference caused by modifications of this equipment or the substitution or
attachment of connecting cables and equipment other than those specified by Thorlabs. The correction of interference caused
by such unauthorized modification, substitution or attachment will be the responsibility of the user. The use of shielded I/O cables
is required when connecting this equipment to any and all optional peripheral or host devices. Failure to do so may violate FCC
and ICES rules.
This precision device should only be shipped if packed into the complete original packaging including the custom cut foam
padding. If necessary, ask for replacement packing material.

MX10C, MX40C Series of Optical Transmitters Chapter 3: Quick Start Guide
Rev. F, February 21, 2020 Page 7
Chapter 3 Quick Start Guide
3.1 Hardware Set Up
For first use, plug the main power cable into the back panel connector, and then plug the other end into an AC wall
receptacle. Flip the power switch on the back panel to the ON (I) position. The unit will now be in the “Standby” mode,
and the front panel standby button should glow amber.
Figure 4 Power Cable Port, Fuse, and Power
Switch
Figure 5 Indicator Glows Amber when Instrument
is In Standby
Attach the polarization-maintaining (PM) loopback fiber optic cable between the Laser Out and Laser In PC/FC connectors on
the front panel. Be sure to clean both ends of the fiber as described in the Maintenance Section of this manual. For the MX10C
series: attach the SMA loopback RF cable between the Amplifier RF Out and Modulator RF In SMA connectors on the front
panel. (This instruction does not apply to transmitters in the MX40C series, as these do not have an Amplifier RF Out port.)
Figure 6 PM Loopback Fiber Cable Installed
Figure 7 Amplifier RF Out present only on the
MX10C series. This cable is not installed on the
MX40C series.
Insert the key into the interlock switch and turn it towards the unlock symbol ( ). This allows the laser to be turned on, but the
LASER ON indicator will not glow green until the laser is actually turned on by the touchscreen button. Turn on the unit by
pressing the amber standby button on the front panel which will then turn green to indicate the unit is fully on. The touchscreen
display will come up with a boot screen for about 5 seconds and then go to the home page. The unit will initialize in the factory
default state with all functions OFF.
Figure 8 Interlock Key Switch
Figure 9 Indicator Glows Green when Instrument is
Fully Enabled

MX10C, MX40C Series of Optical Transmitters Chapter 3: Quick Start Guide
Page 8 TTN048898-D02
3.2 Controls on the Home Page
The MX10C and MX40C series of transmitters can be fully controlled by using the resistive touchscreen display for all functions.
The screen is sensitive to the touch of a finger or a plastic stylus, and selections are made by tapping the on-screen button of
interest. In addition, the knob on the front panel can be used in place of the on-screen arrow buttons for quickly changing set-
point values. Pressing (clicking) the knob will confirm a new set-point value.
Figure 10 Home Screen Features
The Home screen (or dashboard) is organized into three main sections.
The left side contains the ON/OFF buttons for each of the main instrument functions. Tapping any of these buttons will toggle
the function on and off. The same ON/OFF functionality is also available on the individual Settings pages. The power buttons
turn green to indicate the function is ON, and turn red to indicate the function is disabled.
The central section is the main dashboard for reporting operational values of each section. Tapping the screen in this middle
area will take the user to the corresponding Settings page for each section. Note that the green dot in each of these sections
indicates the function is stable. A blinking green dot indicates the function is still stabilizing.
The right side of the screen provides access to the main utility functions of the box.
The screen shot below shows some of the common warning indicators on the HOME page. Some functions can be disabled
when the laser power is low. In this case, buttons may be disabled and warnings indicators may appear.
Figure 11 Home Screen Warnings and Indicators
Tap these buttons
to turn functions
ON or OFF.
Tap in these areas
to go to the related
Settings pages.
Blue Button
Utility Functions
Green Dot
Stability Indicator
Power units (dBm or
mW) are set in the
VOA Settings page.
Disabled
Function
Low Power
Warning
Interlock
Warning

MX10C, MX40C Series of Optical Transmitters Chapter 3: Quick Start Guide
Rev. F, February 21, 2020 Page 9
3.3 System Wavelength Setting
The operational wavelength range of the MX10C and MX40C series extends from 1250 nm to 1610 nm. The three calibration
wavelengths of the power monitors, 1310 nm, 1550 nm, and 1590 nm, represent the centers of the O-band, C-band, and L-band
and provide the user with accurate power readings at or near those wavelengths.
The system wavelength should always be set to the wavelength closest to that of the laser source coupled to the Laser In
bulkhead. The instrument’s system wavelength is factory-preset to correspond to the wavelength band of the integrated laser
source. If an external laser is to be used with the instrument, the system wavelength may need to be changed. This function
exists in the Utility Menu.
From the Home screen, tap the MENU button to bring up the Utility Menu as shown.
Figure 12 Accessing the Utility Menu from the Home Screen
Then tap the System Wavelength bar as shown below to bring up the three wavelength choices. Tap the desired wavelength to
set the System Wavelength.
Figure 13 System Wavelength is Selected from the Utility Menu
Tap the MENU button to
access the Utility Menu.
Tap here to activate
wavelength selection.
Choose one of these
wavelengths.

MX10C, MX40C Series of Optical Transmitters Chapter 3: Quick Start Guide
Page 10 TTN048898-D02
3.4 Controls on the Settings Pages
The Settings pages all follow the same general design and functionality as shown in the example screen shot below. The upper
section with white letters displays the parameters that can be changed. Simply tap on the parameter of interest to highlight it,
and the controls for that parameter will be presented.
The lower section with amber letters displays selected values that are convenient to monitor on that page.
The right-hand column provides the controls for changing the values for the selected parameters. The main control knob on the
front panel can also be used to adjust and confirm selected values. The screen shots below show examples of the touch-screen
controls.
Figure 14 Controls used to Adjust and Save Values of Selected Parameters
Fields that have adjustable values will show a flag if the minimum or maximum values have been reached. These are set by
firmware at the factory.
Figure 15 MIN and MAX Flags Indicate Bounds of Adjustable Value Ranges
Tap to select parameter
Yellow highlight will appear
Increase value
Decrease value
Change step size
Confirm new value
Cancel any changes
Monitor area
MIN / MAX warnings
indicate that the setting
limit for a particular
parameter has been
reached.

MX10C, MX40C Series of Optical Transmitters Chapter 3: Quick Start Guide
Rev. F, February 21, 2020 Page 11
3.5 Quick Start
The following steps summarize the setup procedure required to operate the MX10C and MX40C series in the standard mode.
Please refer to previous sections in this chapter and the expanded operating instructions in Chapter 4 for additional information.
1. Turn on power to the MX10C or MX40C series transmitter via the power switch on the back panel (Figure 4).
2. Press and hold the button on the front panel until the indicator light changes from amber to green (Figure 4 and Figure 8)
3. Turn the key switch to unlock (Figure 8).
4. Turn the laser on by tapping the lower-left touchscreen button on the Home page (Figure 10). Use the utility menu page to
adjust the calibration wavelength if desired (Section 3.3).
5. Take note of the output power, which is shown in the center right section of the Home page (Figure 10).
6. Turn on the VOA controller to adjust output power, if desired, by tapping the center-left touchscreen button on the Home
page (Figure 10 and Section 4.3).
7. Turn on the AMP controller to set desired swing level (Figure 10 and Section 4.2).
8. Apply the input RF signal to the female SMA connector(s) on the front panel (Figure 5), noting the specified limits for limiting
response (Section 5.4). If an input is unused, it must be terminated with one of the included 50-Ohm loads.

MX10C, MX40C Series of Optical Transmitters Chapter 4: Operating Instructions
Page 12 TTN048898-D02
Chapter 4 Operating Instructions
4.1 Control Loop Diagram
The following diagram shows the control loops added to the block diagram. From this picture, the user can see how the power
monitors and VOA are used to provide stability and control to the whole system. It will be helpful to refer to this diagram to gain
a better understanding of the functionality of the unit as described in the upcoming sections of the manual. Note the MX40C
series does not have the external RF loopback.
4.2 Amplifier Settings Page
To get to the Amplifier Settings page, tap on the Amplifier monitor pane on the Home page. The Amplifier has a fixed gain that
it applies to a user input signal. The signal is then routed to the RF input port of the modulator via the front panel loop-back
cable.
There are two Modes for the amplifier: 1) Digital and 2) Analog, but both work with the same fixed gain. Analog mode simply
sets the output swing of the amplifier to maximum.
Figure 16 Selecting between Analog and Digital Amplifier Settings
The default amplifier mode is Digital, in which case the output swing and crossing point can both be adjusted while the gain is
held constant. This digital mode is recommended for OOK (On-Off Keying) digital signals. The VπSwing button is provided to
conveniently set the Max Output Swing to the optimum value to achieve high extinction modulation with the internal modulator.
Tap here to change modes.
Select Analog mode to
provide maximum output
swing.
Select Digital mode to
enable adjustable
output swing.

MX10C, MX40C Series of Optical Transmitters Chapter 4: Operating Instructions
Rev. F, February 21, 2020 Page 13
Figure 17 Digital Amplifier Mode Settings
The Max Output Swing field allows the user to set the peak-to-peak output voltage of the amplifier, assuming the amplifier input
signal is large enough to cause the amplifier to start clipping. The Max Output Swing essentially controls the output amplitude
at which the amplifier starts clipping. When operating in the digital mode, it is expected the user will supply a signal with sufficient
input amplitude to cause the amplifier to clip.
The Crossing Point field allows the user to adjust the eye crossing point in the eye diagram as depicted in the diagram below. It
provides an adjustment to optimize the bit-error-rate (BER) performance of a transmission link by adjusting the amplifier’s internal
threshold levels. If the phase modulation is converted to intensity modulation, then the effect of crossing point adjustments would
be as shown on the graphic below.
Figure 18 Illustration of Different Crossing Point Settings
Tap here to adjust crossing set
point from -100 to +100.
Tap here to optimize output
swing.
Tap here to adjust maximum
output swing in Digital mode.
Eye crossings as a function of
the crossing set-point.

MX10C, MX40C Series of Optical Transmitters Chapter 4: Operating Instructions
Page 14 TTN048898-D02
In the Analog mode, the Max Output Swing is locked at the maximum set point of 7.0 Vpp, so the amplifier can drive the modulator
linearly with minimal distortion. However, in order to do this, the user must supply a signal with small enough amplitude so the
amplifier does not saturate, or clip. This mode is recommended for analog signals or higher order modulation formats such as
PAM4. The crossing point adjustment can usually be left at 0, but the user may find other values achieve lower distortion.
Maximum linear input is listed in the specifications.
Figure 19 Amplifier Crossing Point Setting
Figure 20 Amplifier Gain Curves Illustrate Difference between Digital and Analog Amplifier Modes
Amplifier is in Analog mode,
which sets the output swing to
its maximum value.
Only the crossing point can be
adjusted.
Analog mode sets output swing to
max. Provides largest linear input
region.
(Orange line)
Digital mode provides adjustable swing
and adjustable output amplitude.
Output clips at selectable levels.

MX10C, MX40C Series of Optical Transmitters Chapter 4: Operating Instructions
Rev. F, February 21, 2020 Page 15
4.3 Variable Optical Attenuator Settings Page
To get to the Variable Optical Attenuator (VOA) Settings page, tap in the VOA monitors pane on the Home page. The VOA
provides the means for adjusting and stabilizing the output power after the modulator. Note that the power measurement units
for the entire interface are set on this page. The VOA can operate in either of two modes: 1) Constant Attenuation, and 2)
Constant Output Power.
Figure 21 Constant Attenuation Mode of the VOA
Constant Attenuation Mode maintains a fixed attenuation level between the output of the modulator and the output port on the
front panel. Any fluctuations at the input are transferred to the output.
Figure 22 Constant Attenuation Mode Settings
Constant Output Power Mode acts as a stabilizer by holding the final optical power constant independent of input fluctuations
(within controllable limits such as input power and attenuation).
Figure 23 Constant Optical Output Mode of the VOA
Tap here to change Modes.
Tap here to select Constant
Attenuation mode.
Tap here to select Constant
Output Power mode.
Tap here to change units of all
displayed power measurements.
VOA in Constant
Attenuation Mode
Tap here to change
attenuation level.
Not enough power to reach
the set point.
VOA in Constant Output
Power Mode
Tap here to adjust
output power.
Loss of VOA calibration
due to low power.

MX10C, MX40C Series of Optical Transmitters Chapter 4: Operating Instructions
Page 16 TTN048898-D02
4.4 Laser Settings Page
To access the Laser Settings page, tap on the Laser monitors pane on the Home page. Here the user can control the
laser wavelength and choose whether or not to use the dither feature to stabilize the wavelength. Turning the dither off
will result in lower phase and intensity noise, but the wavelength may drift slightly over time. The monitors on this page
provide live readings of many parameters.
Caution: The laser should not be turned on unless there is an optical fiber connected to the laser out port.
When the internal laser source is a C-Band or L-Band tunable laser, tap on the Laser Monitors pane on the Home page to access
the Laser Settings page. This page is not available when the 1310 nm fixed-wavelength source is the internal laser. When the
internal laser is not the standard C-band tunable laser, the laser type is denoted in the Options label on the rear panel of the
instrument (please see Figure 3 for location of the Options label).
Optical frequency can be set at increments of 50 GHz for C-band or L-band tunable internal lasers. C-band and L-band lasers
also support a fine tuning frequency offset feature, allowing the frequency to be adjusted by an offset from -30.000 GHz to
+30.000 GHz. The ITU channel number on these pages is an index number given only for convenience, which is unique to this
instrument; actual frequencies and spacings are specified by the ITU standard.
To adjust the ITU channel, tap on the ITU CHANNEL row and use the arrow buttons to increment or decrement the channel.
Press the green check mark to accept the new channel, or the red cancel button to abort the change. You may also use the
adjustment knob. Note that you are initially editing by channel, as indicated by the STEP CHAN button. Note that the frequency
and wavelength value are estimated based on the laser’s nominal 50 GHz channel spacing, not measured by the instrument.
Figure 24 Changing the ITU Channel Number
To apply a fine-tuning frequency offset, tap the STEP CHAN button. The button will cycle to the next mode, STEP 10GHz. In
this mode, using the up or down arrows or control knob will adjust the most significant digit of the frequency offset. Tapping the
button repeatedly will cycle through the STEP 1GHz, STEP 100MHz, STEP 10MHz, and STEP 1MHz modes, allowing you to
edit the offset in finer units of 1GHz, 100MHz, 10MHz, or 1MHz. Tapping the button one more time will cycle back to STEP
CHAN mode.
Tap here to change the laser
wavelength
Calculated frequency and
wavelength are displayed in
the monitor section.
Tap here to change the STEP size