Teledyne Lecroy OE695G User manual

Operator’s
Manual
OE695G
Opti
cal-to-
Electrical
Converter

OE695G Optical-to-Electrical Converter
Operator’s Manual
April, 2017

OE695G Optical-to-Electrical Converter Operator’s Manual
© 2017 Teledyne LeCroy, Inc. All rights reserved.
Unauthorized duplication of Teledyne LeCroy documentation materials other
than for internal sales and distribution purposes is strictly prohibited.
Customers are permitted to duplicate and distribute Teledyne LeCroy
documentation for internal educational purposes.
Teledyne LeCroy is a registered trademarks of Teledyne LeCroy, Inc. Other
product or brand names are trademarks or requested trademarks of their
respective holders. Information in this publication supersedes all earlier
versions. Specifications are subject to change without notice.
928329-00 Rev A
April, 2017

Operator’s Manual
928329-00 Rev A i
Warranty
Teledyne LeCroy warrants this oscilloscope accessory for normal use and
operation within specification for a period of one year from the date of
shipment. Spare parts, replacement parts and repairs are warranted for 90
days.
In exercising its warranty, Teledyne LeCroy, at its option, will either repair or
replace any assembly returned within its warranty period to the Customer
Service Department or an authorized service center. However, this will be
done only if the product is determined by Teledyne LeCroy's examination to
be defective due to workmanship or materials, and the defect is not caused
by misuse, neglect, accident, abnormal conditions of operation, or damage
resulting from attempted repair or modifications by a non-authorized service
facility.
The customer will be responsible for the transportation and insurance
charges for the return of products to the service facility. Teledyne LeCroy will
return all products under warranty with transportation charges prepaid.
This warranty replaces all other warranties, expressed or implied, including
but not limited to any implied warranty of merchantability, fitness or
adequacy for any particular purposes or use. Teledyne LeCroy shall not be
liable for any special, incidental, or consequential damages, whether in
contract or otherwise.

OE695G Optical-to-Electrical Converter
ii
Table of Contents
Safety..............................................................................................1
Introduction.....................................................................................2
Key Features: .................................................................................. 3
Operating Environment .................................................................. 3
Operation ........................................................................................4
Connecting the Unit to the Oscilloscope ...................................... 4
Connecting the Unit to the Optical Fiber....................................... 4
Operation with a Teledyne LeCroy Oscilloscope.......................... 4
Warning Messages ......................................................................... 7
Performance Verification.................................................................8
CW Gain ........................................................................................... 8
Optical Reference Receiver Response .......................................... 9
Care and Maintenance...................................................................11
Cleaning the OE695G.................................................................... 11
Calibration Interval ....................................................................... 11
Service Strategy............................................................................ 11
Returning a Product for Calibration or Service........................... 12
Technical Support......................................................................... 13
Certifications.................................................................................14
EMC Compliance........................................................................... 14
Safety Compliance........................................................................ 15
Environmental Compliance .......................................................... 15

Operator’s Manual
1
Safety
Symbols
These symbols appear on the product or in its documentation to alert you to
important safety considerations.
CAUTION of potential damage to product, or WARNING of potential for bodily injury.
Attend to the accompanying information to protect against injury or damage. Do not
proceed until conditions are fully understood and met.
Laser Safety WARNING.
CAUTION, contains parts/assemblies susceptible to damage by Electrostatis Discharge.
Optical Connection Safety Instructions
Do not install or terminate fibers while a light source is active. Care
must be taken to ensure that the instrument has been turned OFF
before inspecting the end face(s) of the instrument, or any optical
patch cords connected to this instrument. Never look directly into a
live fiber, and ensure that your eyes are protected at all times.
When making optical connections, always clean the optical connector to
ensure the facet is free from dirt or impurities. See instructions on p.11.
Electrical Safety Instructions
Exercise electro-static discharge precautions. The assembly contains
static-sensitive components. When making RF connections, always
wear a grounding wrist strap.

OE695G Optical-to-Electrical Converter
2
Introduction
The OE695G is designed to help troubleshoot optical-to-electrical signal
integrity issues at the board level. For system integrators who measure both
electrical and optical signals in their products, the OE695G provides electrical
measurements on optical signals, while taking full advantage of the Teledyne
LeCroy real-time oscilloscope tool set and the debugging capabilities of the
Teledyne LeCroy Serial Data and Crosstalk Analysis software options.
When connected to the oscilloscope, the OE695G becomes an integrated
part of the oscilloscope. Power is supplied to the OE695G by the
oscilloscope (no external power supply is needed), and the OE695G
communicates to the oscilloscope its identity and scaling information. The
Optical Wavelength, Dark Calibration and Reference Receiver functions are all
controlled from the oscilloscope’s user interface.
The OE695G is unique in that it operates with a real-time oscilloscope, not a
sampling oscilloscope, and uses a digital signal processing (DSP) filter to
enable a user-selectable reference receiver response. Since the optical input
signal is input to a real-time oscilloscope, it is possible to use the contiguous
data acquisition of the real-time oscilloscope to obtain serial data pattern
knowledge and provide Tj, Rj, and Dj decomposition to very high accuracy,
like what is done with high-speed electrical serial data signals. The low cost
and general utility of this optical to electrical converter makes it ideal for
those who are already using real-time oscilloscopes for electrical serial data
measurements, and need to also measure optical serial data signals as well.
The OE695G is compatible with a variety of Teledyne Lecroy oscilloscopes
running firmware version 6.9.0.0 or later. Check the oscilloscope product
page at teledynelecroy.com/oscilloscopes for compatibility.

Operator’s Manual
3
Key Features:
•Frequency range DC to 9.5 GHz (electrical, -3 dB)
•Selectable reference receiver support, including:
8GFC (8.5 Gb/s)
10GBASE-W (9.953 Gb/s)
OC192 (STM64) (9.953 Gb/s)
10GBASE-R (10.3125 Gb/s)
10GFC (10.519 Gb/s)
ITU-T G.975 FEC (10.664 Gb/s)
ITU-T G.709 FEC (10.709 Gb/s)
10 GbE FEC (11.096 Gb/s)
10GFC FEC (11.317 Gb/s)
User Defined (up to 11.5 Gb/s)
None (maximum 12.667 Gb/s)*
* Cannot meet reference receiver specification past 11.5 Gb/s.
•62.5/125 μm multi-mode or single-mode fiber input
•Broad wavelength range (750 to 1650 nm)
•+7 dBm (5 mW) max peak optical power
•Low noise (as low as 25 pW/√Hz)
Operating Environment
The accessory is intended for indoor use and should be operated in a clean,
dry environment. Before using this product, ensure that its operating
environment is maintained within these parameters:
Temperature: 5 to 40 °C.
Humidity: Maximum relative humidity 80 % for temperatures up to 31 °C
decreasing linearly to 50 % relative humidity at 40 °C.
Altitude: Up to 10,000 ft (3,048 m).

OE695G Optical-to-Electrical Converter
4
Operation
Connecting the Unit to the Oscilloscope
To connect the optical to electrical converter to a Teledyne LeCroy
oscilloscope:
1. Attach the OE695G 2.92mm connections to the oscilloscope 2.92mm
interface. Use a torque wrench to provide appropriate torque when
tightening.
2. If connecting to a ProLink interface, first connect the LPA 2.92mm
ProLink to 2.92mm adapter to the oscilloscope, then connect the
OE695G to the adapter.
3. Connect the OE695G LEMO connector to the power connection of the
oscilloscope 2.92mm interface or the LPA-2.92 adapter. Align the red dot
on the cable to the red mark on the connector.
4. Verify the LEMO power connector is locked to the connection.
5. Connect the other end of the SMA cable to the converter, if not already
connected. Use a torque wrench to ensure proper torque.
6. Connect the other end of the LEMO power cable to the OE695G.
7. To disconnect power, pull on the LEMO connector tip to release the lock
and pull out the LEMO connector.
Connecting the Unit to the Optical Fiber
A plastic cap covers the FC/PC input connector. Carefully remove this cover
and insert a fiber optic cable with a cladding dimension of 125 µm. The core
diameter should nominally be 62.5 µm. Other core diameters may be used
with the OE695G, but a smaller or larger diameter will alter the amount of
light falling on the photo-receiver and impact the gain accuracy of the
OE695G. Both multi-mode and single-mode fibers may be used with the
OE695G provided they are mechanically compatible.
Operation with a Teledyne LeCroy Oscilloscope
After the OE695G connectors are attached, the converter can be controlled
through the oscilloscope. Turning the VOLTS/DIV knob will control the
oscilloscope’s scale factor to give full dynamic range in µW/div.

Operator’s Manual
5
Channel Dialog
When the OE695G is connected to a particular channel, the respective
Channel dialog will change to reflect the connection of the device:
•An C x OE695G tab for controlling the converter is added behind the
Channel dialog (Figure 1).
•Gain settings are adjusted and vertical scale labels automatically change
to µW/div units
•Coupling, bandwidth limit (BWL), and other selections are prohibited
since they must be preset to certain values to allow proper functioning of
the OE695G. The channel coupling is shown as OPT (optical).
Figure 1 shows the oscilloscope user interface menu for the OE695G
converter. The dialog allows for the selection of the converter’s Dark
Calibration, Reference Receiver selection and Optical Wavelength selection
functions.
Figure 1: OE695G tab of the oscilloscope’s Channel dialog.
Dark Calibration
The OE695G incorporates a Dark Calibration function to measure the channel
offset signal without any light present in the optical receiver.
To perform dark calibration, cover the OE695G input with the supplied cap,
and press the Dark Calibration button on the OE695G dialog. A scale factor
value will be calculated and displayed.
Dark calibration will vary with internal OE695G temperature (the dark
calibration level variation with temperature is -2 μW/ ºC typical), so if the
device temperature varies considerably, additional dark calibrations may be
required. After a dark calibration is performed, the temperature it was
performed at will be displayed in the Attributes section of the OE695G dialog,
to the right.
Touch Set to Zero to reset the Dark Calibration value to zero.

OE695G Optical-to-Electrical Converter
6
Reference Receiver
The OE695G contains optional, built-in software reference receiver filters for
common Fiber Channel, Ethernet, and ITU telecom standards. These
reference receiver filters provide a 4-pole Bessel Thompson low pass filter
response for the combined oscilloscope and optical-to-electrical (O-E)
system with the -3dBe (electrical) power at 0.75* bitrate.
Available reference receiver filters include:
8GFC (8.5 Gb/s)
10GBASE-W (9.953 Gb/s)
OC192 (STM64) (9.953 Gb/s)
10GBASE-R (10.3125 Gb/s)
10GFC (10.519 Gb/s)
ITU-T G.975 FEC (10.664 Gb/s)
ITU-T G.709 FEC (10.709 Gb/s)
10 GbE FEC (11.096 Gb/s)
10GFC FEC (11.317 Gb/s)
User Defined (up to 11.5 Gb/s)
None (maximum 12.667 Gb/s)
The software reference receiver supplied standard with the OE695G is based
on a “nominal” oscilloscope response. The typical uncertainty in this
standard reference receiver frequency response is ±1.6 dBe up to Fref
=0.75*bit rate and ±4 dBe 2*bitrate setting.
An OE695G-REFCAL OE695G reference receiver calibration can be purchased
that will provide less uncertainty with the OE695G when used with a specific
oscilloscope and a specific channel. This REFCAL is usually purchased at
the time of initial OE695G and oscilloscope purchase. If this is the case,
Teledyne LeCroy will calibrate the specific OE695G to a specific serial
number oscilloscope channel (channel 4 unless otherwise specified) and the
resultant reference receiver uncertainty will be ±0.85 dBe up to Fref =0.75*bit
rate, and ±4 dBe 2*bit rate setting on the specified oscilloscope input channel
on the 11, 17, 20, 30, 39, 50, 75, 90, or 100 mV/div gain ranges. The
calibration will be indicated on the OE695G dialog, shown above. Multiple
OE695G can be calibrated to unique oscilloscope channels to allow usage of
multiple OE695G.
NOTE: If the OE695G-REFCAL is purchased after the initial
OE695G/oscilloscope purchase, the oscilloscope must be returned to
Teledyne LeCroy for the OE695G-REFCAL to be performed.
A custom reference receiver (User Defined) can be applied for any bit rate up
to 11.5 Gb/s. Bit rates up to 12.5 Gb/s bit rates may be specified, but beyond
11.5 Gb/s, the reference receiver requirements cannot be maintained.

Operator’s Manual
7
Input Selection for Optical Wavelength
There are four standard optical wavelength selections at 785nm, 850nm,
1310nm and 1550nm. Custom optical wavelength can be adjusted between
750nm to 1650nm; however, gain of the OE695G can vary widely at different
wavelengths, and calibration of gain is only performed at the standard
wavelengths. At other wavelengths, gain is assumed to follow a linear slope,
but this assumption will not yield the stated vertical level power accuracy
specification. However, the overall signal fidelity will still be maintained.
Warning Messages
These messages may appear during operation with an oscilloscope.
Warning Message
Explanation
XML data not found
Warns that the XML file containing additional information
regarding calibration of the probe is not present, and the
probe would work in only a very limited way. If you see this
message, stop using the probe and contact Teledyne
LeCroy for support.
Nominal reference receiver
response applied
The oscilloscope channel connected to the OE695G does
not match any previously calibrated channels, therefore a
nominal reference receiver response is applied.
Calibrated reference receiver
response applied
The scope channel connected to the OE695G matches one
of the recalibrated scope channels of the OE695G. This
should be the normal operation mode.
Reference receiver active only
at 10 GS/s or greater
The sampling rate is too low. Enter at least the minimum
sampling rate necessary for the reference receiver.
Performance may not meet
all specifications of standard.
Calibration temperature
(TEMP )
The temperature at which the probe was calibrated and the
temperature of the connected probe are different. TEMP
would be replaced by the calibration temperature.
Temperature changed since
last Dark Calibration
recommended
The Dark Calibration temperature and the current probe
temperature are different.

OE695G Optical-to-Electrical Converter
8
Performance Verification
CW Gain
Required Equipment
•OE695G and compatible oscilloscope
•CW laser source at the desired optical wavelength
•Variable optical attenuator (or use variable output level of CW source)
•Optical power meter calibrated for the optical wavelength of the source
•Multimode optical fiber patch cable
Procedure
1. Connect the OE695G to a compatible oscilloscope channel and allow to
fully warm-up for at least 20 minutes.
2. Configure the following settings on the oscilloscope:
•Recall Default setup
•Enable the channel with the OE695G, disable others
•Configure the active channel for the optical wavelength matching the
laser source
•Create a measurement for the mean value of the channel
•Enable measurement statistics.
3. Connect the optical attenuator (if used) input fiber to the laser source or
connect a fiber patch cable to the output of the laser source. Before
mating, carefully clean the fiber connections with an appropriate fiber
cleaning cloth.
4. Set the attenuator/laser for an output level of approximately 60 uW.
5. Connect the patch/attenuator output cable to the optical power meter
and note the Input Power Measurement: _________ uW
6. With the OE695G optical input cover closed, perform a dark calibration
(page 5). Press Clear Sweeps on the oscilloscope front panel. From the
statistical mean value of the mean measurement, note the Residual Dark
Level:___________ uW
7. Connect the patch/attenuator output cable to the OE695G optical input.
Press Clear Sweeps on the oscilloscope front panel, and using the
statistical mean of the mean measurement, note the Observed Power
Level:_____________ uW

Operator’s Manual
9
8. Compute the normalized error fraction:
err-frac = [(Observed – Residual) – Input]/Input
The error fraction should be in the range –Δ< err-frac < +Δwhere Δis
determined by the sum of the magnitudes of the allowed OE695G
uncertainty (e.g., 10% or 0.1) and the optical power meter uncertainty
(e.g., 6% or 0.06). In this example Δ= 0.16.
9. If an incorrect result is obtained, repeat the measurement sequence with
careful cleaning and mating of the optical interfaces, which are prone to
variation from small particles, oils, or other non-idealities.
Optical Reference Receiver Response
Required Equipment
•OE695G and compatible oscilloscope with ≥20 GHz channel bandwidth
•< 1 ps FWHM optical pulsed laser source, 1550 nm optical wavelength
•Variable optical attenuator
Procedure
1. Connect the OE695G to a compatible oscilloscope channel with a
channel specific calibration and allow to fully warm-up.
2. Preset the optical attenuator for high attenuation (safest for protecting
the OE695G).
3. Connect the optical attenuator to the pulsed laser source.
4. Connect pulsed laser source trigger output to oscilloscope Aux input.
5. Configure the following settings on the oscilloscope:
•Recall Default setup
•Enable the channel with the OE695G, disable others
•Configure the active channel for 1550 nm optical wavelength, 50
uW/div, Sin x/x interpolation
•Configure the trigger for Aux In, Normal, and adjust the trigger level
for proper trigger
6. Locate the optical pulse (reduce attenuation if necessary) and adjust
oscilloscope time settings to center the pulse on screen with 1 ns/div.
7. Adjust the optical attenuator for peak pulse amplitude 60 uW.
8. Set channel pre-processing averaging to 10,000.

OE695G Optical-to-Electrical Converter
10
9. Create a dual Math Trace using the following settings:
•Rescale(FFT(<targetchannel>))
•FFT parameters: Output Type = Power Spectrum, Window =
Rectangular, else defaults
•ReScale parameters: First Multiply by= 2.0, else defaults
•Zoom: Horizontal Center= 10 GHz, Scale/div= 2 GHz, Vertical Scale =
10 dB/div, Center = adjust as necessary to display trace on screen.
NOTE: The scale factor makes the vertical units dBe (electrical) instead
of dBo (optical power). Optical reference receiver specifications are in
terms of dBe.
10. With the OE695G optical input cover closed, perform a dark calibration
(page 5).
11. Connect the attenuator output cable to OE695G optical input.
12. Configure the channel optical receiver for the desired response
(e.g., Custom - 10 Gb/s (Fr = 7.5 GHz)).
13. Press Clear Sweeps on the oscilloscope front panel.
14. Observe frequency response and compare it to the ideal BT-4 response
in the table below, confirm it is within limits.
Freq/Fr
4BT Ideal
Response (dBe)
Allowed
Tolerance (dB)
Max Limit
(dBe)
Min Limit
(dBe)
0
0
0.85
+0.85
-0.85
0.2
-0.11
0.85
+0.74
-0.96
0.4
-0.45
0.85
+0.40
-1.30
0.6
-1.02
0.85
-0.17
-1.87
0.8
-1.86
0.85
-1.01
-2.71
1.0
-3.01
0.85
-2.16
-3.86
1.2
-4.51
1.48
-3.03
-5.99
1.4
-6.37
2.11
-4.26
-8.48
1.6
-8.54
2.74
-5.80
-11.28
1.8
-10.93
3.37
-7.56
-14.30
2.0
-13.41
4.00
-9.41
-17.41

Operator’s Manual
11
Care and Maintenance
Cleaning the OE695G
The exterior of the converter should be cleaned with a soft cloth moistened
with either water or 75% isopropyl alcohol solution only. Under no
circumstances should moisture be allowed to penetrate the converter.
The fiber connector can be cleaned by blowing residue-free air into the
connector to remove loose particles. A cleaning cloth tape specifically made
for fiber cleaning may also be used by first removing the FC universal
connector adapter from the front panel to expose the internal fiber interface.
Calibration Interval
The recommended calibration interval is one year. Adjustment should be
performed only by qualified personnel.
Service Strategy
Defective products must be returned to a Teledyne LeCroy service facility for
diagnosis and repair or replacement. Defective products under warranty are
repaired or replaced. Before returning a product as defective:
•Verify the Teledyne LeCroy oscilloscope is running firmware 6.9.0.0 or
higher. To verify the firmware version of your oscilloscope, choose
Utilities > Utilities Setup > Status.
•Check the power connector is plugged in and locked, and the SMA cable
is connected.

OE695G Optical-to-Electrical Converter
12
Returning a Product for Calibration or Service
To return a probe for calibration or service, contact your local Teledyne
LeCroy sales/service center. They will tell you where to return the product. All
returned products should be identified by both model and serial number.
Provide your name and contact number, and a brief description of the defect
or failure.
Products returned to the factory require a Return Material Authorization
number (RMA).
Return shipment should be prepaid. Teledyne LeCroy cannot accept COD or
Collect Return shipments. We recommend air-freighting.
1. Contact your local Teledyne LeCroy sales or service representative to
obtain a Return Material Authorization.
2. Remove all accessories from the product. Do not include the manual.
3. Pack the product in its case, surrounded by the original packing material
(or equivalent).
4. Label the case with a tag containing
•The RMA
•Name and address of the owner
•Product model and serial number
•Description of failure
5. Package the product case in a cardboard shipping box with adequate
padding to avoid damage in transit.
6. Mark the outside of the box with the shipping address given to you by the
Teledyne LeCroy representative. Be sure to add the following:
•ATTN: <RMA assigned by the Teledyne LeCroy representative>
•FRAGILE
7. Insure the item for the replacement cost of the product.
8. If returning a product to a different country, also:
•Mark shipments returned for service as a “Return of US
manufactured goods for warranty repair/recalibration.”
•If there is a cost involved in the service, put the service cost in the
value column and the replacement value of the product in the body
of the invoice marked “For insurance purposes only.”
•Be very specific as to the reason for shipment. Duties may have to
be paid on the value of the service.

Operator’s Manual
13
Technical Support
Live Support
Registered users can contact their local Teledyne LeCroy service center at
the number listed on our website.
You can also submit Technical Support requests via the website at:
teledynelecroy.com/support/techhelp
Resources
Teledyne LeCroy publishes a free Technical Library on its website. Manuals,
tutorials, application notes, white papers, and videos are available to help you
get the most out of your TeledyneLeCroy products. Go to:
teledynelecroy.com/support/techlib
The Datasheet published on the product page contains the detailed product
specifications.
Service Centers
For a complete list of offices by country, including our sales & distribution
partners, visit: teledynelecroy.com/support/contact
Teledyne LeCroy
700 Chestnut Ridge Road
Chestnut Ridge, NY, 10977, USA
teledynelecroy.com
Sales and Service:
Ph: 800-553-2769 / 845-425-2000
FAX: [phone]
[e-mail]
Support:
Ph: 800-553-2769
[e-mail]

OE695G Optical-to-Electrical Converter
14
Certifications
Teledyne LeCroy certifies compliance to the following standards as of the
date of publication. For the current certifications, see the EC Declaration of
Conformity shipped with your product.
EMC Compliance
EC Declaration of Conformity - EMC
The converter meets the intent of EC Directive 2014/30/EU for
Electromagnetic Compatibility. Compliance was demonstrated to the
following specifications as listed in the Official Journal of the European
Communities:
IEC/EN 61326-1:2013 EMC requirements for electrical equipment for
measurement, control, and laboratory use 1
ELECTROMAGNETIC EMISSIONS:
IEC/EN 55011/A1:2010 Radiated and Conducted Emissions Group 1 Class A 2 3
ELECTROMAGNETIC IMMUNITY:
IEC/EN 61000-4-2:2009 Electrostatic Discharge, 4 kV contact, 8 kV air, 4 kV
vertical/horizontal coupling planes 4
IEC/EN 61000-4-3/A2:2010 RF Radiated Electromagnetic Field, 3 V/m, 80-
1000 MHz; 3 V/m, 1400 MHz - 2 GHz; 1 V/m, 2 GHz - 2.7 GHz
1 To ensure compliance with the applicable EMC standards, use high quality shielded interface
cables.
2 This product is intended for use in nonresidential areas only. Use in residential areas may cause
electromagnetic interference.
3Emissions which exceed the levels required by this standard may occur when the probe is
connected to a test object.
4 Meets Performance Criteria “B” limits of the respective standard: during the disturbance, product
undergoes a temporary degradation or loss of function or performance which is self-recoverable.
EUROPEAN CONTACT:*
Teledyne LeCroy Europe GmbH
Im Breitspiel 11c
D-69126 Heidelberg
Germany
Tel: [phone]