evertz 2405EO-HD User manual

Model 2405EO-HD
SMPTE 292M Re-Clocking
Electrical to Fiber Converter
Instruction Manual
© Copyright 2001 - 2008
EVERTZ MICROSYSTEMS LTD.
5288 John Lucas Drive, Burlington, Ontario, Canada, L7L 5Z9
Phone:[phone]
Fax: [phone]
Internet: Sales: [email protected]
Tech Support: [email protected]
Web Page: http://www.evertz.com
Version 1.3 June 2008
The material contained in this manual consists of information that is the property of Evertz Microsystems
and is intended solely for the use of purchasers of the 2405EO-HD Fiber Converter. Evertz Microsystems
expressly prohibits the use of this manual for any purpose other than the operation of the Fiber Converter.
All rights reserved. No part of this publication may be reproduced without the express written permission
of Evertz Microsystems Ltd. Copies of this guide can be ordered from your Evertz products dealer or from
Evertz Microsystems.

INFORMATION TO USERS IN EUROPE
NOTE
CISPR 22 CLASS A DIGITAL DEVICE OR PERIPHERAL
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to the European Union EMC directive. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
INFORMATION TO USERS IN THE U.S.A.
NOTE
FCC CLASS A DIGITAL DEVICE OR PERIPHERAL
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which case the user will be required to correct
the interference at his own expense.
WARNING
Changes or Modifications not expressly approved by Evertz Microsystems Ltd. could void the user’s
authority to operate the equipment.
Use of unshielded plugs or cables may cause radiation interference. Properly shielded interface cables
with the shield connected to the chassis ground of the device must be used

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3
REVISION HISTORY
REVISION DESCRIPTION DATE
1.0 Original Version Apr 01
1.1 Changes to specifications, remove –L versions May 02
1.2 Updated safety section and added assembly and labeling section Jul 05
1.3 Fixed formatting Jun 08

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3
This page left intentionally blank

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3
TABLE OF CONTENTS
1. OVERVIEW.........................................................................................................................................1
2. INSTALLATION..................................................................................................................................3
2.1. CARE AND HANDLING OF OPTICAL FIBER..........................................................................4
2.1.1. Safety.............................................................................................................................4
2.1.2. Assembly........................................................................................................................4
2.1.3. Labeling..........................................................................................................................4
2.1.4. Handling And Connecting Fibers ...................................................................................5
3. SPECIFICATIONS..............................................................................................................................6
3.1. SERIAL VIDEO INPUT..............................................................................................................6
3.2. SERIAL VIDEO OUTPUTS........................................................................................................6
3.3. OPTICAL OUTPUT....................................................................................................................6
3.4. ELECTRICAL ............................................................................................................................7
3.5. PHYSICAL.................................................................................................................................7
4. STATUS LEDS...................................................................................................................................8
5. USER CONTROLS.............................................................................................................................9
5.1. SELECTING RECLOCK OR NON-RECLOCK MODE..............................................................9
5.2. SETTING THE EQUALIZER WARNING THRESHOLD............................................................9
6. FIBER OPTICS SYSTEM DESIGN ..................................................................................................10
6.1. SYSTEM DESIGN PARAMETERS .........................................................................................11
6.1.1. Electrical to Optical Parameters...................................................................................11
6.1.1.1. Transmitter Output Launch Power.................................................................11
6.1.1.2. Wavelength....................................................................................................11
6.1.1.3. Linewidth .......................................................................................................12
6.1.2. Optical to Electrical Parameters...................................................................................13
6.1.3. Passive Optical Module Parameters............................................................................13
6.2. DESIGN EXAMPLES...............................................................................................................14
6.2.1. Standard Definition 2 km Link ......................................................................................14
6.2.2. 20 Km Link With 2 Standard Definition Signals On 1 Fiber..........................................15
6.3. CALCULATING THE OPTICAL SYSTEM POWER BUDGET................................................16
6.4. CARE AND HANDLING OF OPTICAL FIBER........................................................................17
6.4.1. Safety...........................................................................................................................17
6.4.2. Handling And Connecting Fibers .................................................................................17

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3
6.4.3. Making Sure The Optical Fibers Are Clean..................................................................17
Figures
Figure 1-1: 2405EO-HD Block Diagram.............................................................................................................. 2
Figure 2-1: 2405EO-HD Module ......................................................................................................................... 3
Figure 2-2: Typical 2405EO-HD Certification and Identification Label ............................................................... 5
Figure 6-1: Components of a Fiber Optic Transmission System...................................................................... 10
Figure 6-2: Cables Losses at Various Wavelengths......................................................................................... 12
Figure 6-3: Spectrum of DFB Laser used in EO3D-HD, EO5D-HD and EOxx-HD .......................................... 12
Figure 6-4: Spectrum of FP Laser used in EO3F and EO3F-HD...................................................................... 13
Tables
Table 5-1: DIP Switch Functions......................................................................................................................... 9
Table 5-2: Reclock Mode Switch Setting ............................................................................................................ 9
Table 6-1: Launch Power.................................................................................................................................. 11
Table 6-2: Optical Receiver Power Parameters................................................................................................ 13
Table 6-3: Passive Module Insertion Loss........................................................................................................ 13

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3 2405EO-HD-1
1. OVERVIEW
The 2405EO-HD Electrical to Fiber converter provides an economical method of connecting in-plant
coaxial distribution and longer distance optical distribution for SMPTE 292M (1.5 Gb/s) HDTV serial digital
signals. The companion 2405OE-HD or 7705OE-HD Fiber to Electrical converters facilitate conversion
back to coaxial distribution at the destination. The 2405EO-HD converter features one auto-equalized
coaxial input with two reclocked serial digital outputs and one reclocked fiber output. The 2405EO-HD has
been designed to be used primarily as a reclocking 1.5Gb/s distribution amplifier and converter, however,
it can also be used as a non-reclocking SMPTE 310M (19.4 Mb/s), DVB-ASI or SMPTE 259M(143 to 540
Mb/s) distribution product.
The 2405EO-HD is available in different versions to meet a variety of applications. (See specifications for
complete information)
2405EO3F-HD 1310 nm MQW Suitable for distances up to 6 Km @ 1.5 Gb/s
2405EO3D-HD 1310 nm DFB Suitable for distances up to 40 Km @ 1.5 Gb/s
2405EO5D-HD 1550 nm DFB Suitable for distances up to 50 Km @ 1.5 Gb/s
There are several versions with built in isolators specifically suited to coarse wave division multiplexing
(CWDM) applications. These versions are suitable for distances up to 50 Km @ 1.5 Gb/s
2405EO47-HD 1470 nm DFB
2405EO49-HD 1490 nm DFB
2405EO51-HD 1510 nm DFB
2405EO53-HD 1530 nm DFB
2405EO55-HD 1550 nm DFB
2405EO57-HD 1570 nm DFB
2405EO59-HD 1590 nm DFB
2405EO61-HD 1610 nm DFB
Features:
• Reclocking mode for SMPTE 292M (1.5 Gb/s) signals
• Non-reclock mode for SMPTE 310M (19.4 Mb/s), SMPTE 259M (143 to 540 Mb/s) or DVB-ASI, or
most other bit rates less than 1.5 Gb/s
• Independent isolated output drivers to ensure no cross channel loading effects and maintain polarity
from input to output for DVB-ASI applications
• Automatic cable equalization to 130 m
• Automatic laser shutdown on absence of input signal for extended laser life
• Operation with multi-mode or single-mode fiber
• SC/PC, ST/PC or FC/PC connector options
• Comprehensive signal, laser and module status indicator LEDs
• Low power +12 VDC operation

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
2405EO-HD-2 Revision 1.3
*Note: Non-reclock Mode will operate 19.4 Mb/s to 1.5 Gb/s
2
Cable Driver
Cable Driver
Optical
Driver
Non-Reclock
Serial Video Input
BNC Input
Active
Signal No Carrier
Serial BNC
Outputs
(Output 1 is
DVB-ASI
compliant
Optical
Output
Equalizer
EQ
Warning
1
Laser
Fault
RCLK/THRU
Reclocker
Figure 1-1: 2405EO-HD Block Diagram

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3 2405EO-HD-3
2. INSTALLATION
The 2405EO-HD is a compact module that has three BNC connectors and one SC/PC (shown), ST/PC or
FC/PC optical connector.
Figure 2-1: 2405EO-HD Module
HD INPUT: Input BNC connector for 10-bit serial digital video signals compatible with the SMPTE 292M
standard. The 2405EO-HD can also be used in non-reclock mode with SMPTE 310M
(19.4 Mb/s), SMPTE 259M (143 to 540 Mb/s) or DVB-ASI, or most other signals with bitrate
less than 1.5 Gb/s. See section 5.1 for information on operating the module in non-reclock
mode.
HD OUTPUT: There are two BNC connectors with reclocked serial component video outputs, compatible
with the SMPTE 292M standard. In non-reclock mode these outputs contain an equalized copy
of the input signal.
There is one SC/PC (shown), ST/PC or FC/PC female connector with reclocked serial
component video outputs, compatible with the SMPTE 292M standard. This connector is the
optical output from the 2405EO-HD as shown in section 3.3.
The 2405EO-HD comes with an auto-ranging DC voltage adapter that automatically senses the
input voltage. Power should be applied by connecting a 3-wire grounding type power supply
cord to the power entry module on the DC voltage adapter. The power cord should be
minimum 18 AWG wire size; type SST marked VW-1, maximum 2.5 m in length. The DC cable
of the voltage adapter should be connected to the DC power jack on the rear panel. A green
LED located beside the power connector will be illuminated when there is power applied to the
2405EO-HD.

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
2405EO-HD-4 Revision 1.3
2.1. CARE AND HANDLING OF OPTICAL FIBER
2.1.1. Safety
CLASS 1 LASER PRODUCT
Background colour: yellow
Triangular band: black
Symbol: black
2.1.2. Assembly
Assembly or repair of the laser sub-module is done only at Evertz facility and performed only by Evertz
technical personnel.
2.1.3. Labeling
Certification and Identification labels are combined into one label and it is located in the middle of the
chassis, on the bottom, close to the rear. Date of manufacture can be traced by bar code provided on the
label.
!

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3 2405EO-HD-5
Figure 2-2: Typical 2405EO-HD Certification and Identification Label
(Serial # and bar code differ from unit to unit)
2.1.4. Handling And Connecting Fibers
"
Never touch the end face of an optical fiber. Always keep dust caps on optical fiber
connectors when not connected and always remember to properly clean the optical end
facet of a connector before making a connection.
The transmission characteristics of the fiber are dependent on the shape of the optical core and therefore
care must be taken to prevent fiber damage due to heavy objects or abrupt fiber bending. Evertz
recommends that you maintain a minimum bending radius of 5 cm to avoid fiber-bending loss that will
decrease the maximum attainable distance of the fiber cable. The Evertz fiber optic modules come with
cable lockout devices, to prevent the user from damaging the fiber by installing a module into a slot in the
frame that does not have a suitable I/O module.

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
2405EO-HD-6 Revision 1.3
3. SPECIFICATIONS
3.1. SERIAL VIDEO INPUT
Standards:
Normal: SMPTE 292M
Non-Reclock Mode: SMPTE 310M (19.4 Mb/s) or
SMPTE 259M A, B, C, D, or
DVB-ASI or most other bit rates less than 1.5 Gb/s
Connector: 1 BNC per IEC 169-8
Equalization: Automatic to 130m @ 1.5Gb/s with Belden 1694 or equivalent cable
Return Loss: > 15 dB up to 1 Gb/s, > 12 dB up to 1.5 Gb/s
3.2. SERIAL VIDEO OUTPUTS
Number of Outputs: 2 Reclocked
Standards: Same as input
Connectors: BNC per IEC 169-8
Signal Level: 800mV nominal
DC Offset: 0V ±0.5V
Rise and Fall Time: 200 ps nominal
Overshoot: <10% of amplitude
Return Loss: > 15 dB up to 1 Gb/s, > 12 dB up to 1.5 Gb/s
Wide Band Jitter: < 0.15 UI (reclocked)
3.3. OPTICAL OUTPUT
Standard: SMPTE 292M
Number of Outputs: 1 reclocked
Connector: SC/PC, ST/PC or FC/PC female housing
Return Loss: < 14 dB
Rise and Fall Time: 200 ps nominal
Fiber Size: 9 µm core / 125 µm overall
Optical Characteristics:
Model Nominal
Wavelength Laser Feedback Structure Line Width Optical Power
2405EO3F-HD 1310 nm Fabrey Perot < 4.5 nm -7.5 dBm
2405EO5D-HD 1550 nm DFB < 1 nm > 0 dBm
2405EO47-HD 1470 nm DFB < 1 nm > 0 dBm
2405EO49-HD 1490 nm DFB < 1 nm > 0 dBm
2405EO51-HD 1510 nm DFB < 1 nm > 0 dBm
2405EO53-HD 1530 nm DFB < 1 nm > 0 dBm
2405EO55-HD 1550 nm DFB < 1 nm > 0 dBm
2405EO57-HD 1570 nm DFB < 1 nm > 0 dBm
2405EO59-HD 1590 nm DFB < 1 nm > 0 dBm
2405EO61-HD 1610 nm DFB < 1 nm > 0 dBm

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3 2405EO-HD-7
3.4. ELECTRICAL
Voltage: + 12VDC
Power: 6 Watts.
EMI/RFI: Complies with FCC regulations for class A devices.
Complies with EU EMC directive.
DC Power Supply: 115/230 VAC 50/60 Hz, 30 VA
3.5. PHYSICAL
Dimensions: 6“ L x 3.5” W x 1” H
(152mm L x 89mm W x 25mm H)
With Mounting Flanges: 6“ L x 4” W x 1” H
(152mm L x 114mm W x 25mm H)
Weight: 0.5 lbs. (0.28 Kg)

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
2405EO-HD-8 Revision 1.3
4. STATUS LEDS
ACTIVE SIGNAL: This Green LED will be On when there is a valid signal present at the module input.
NO CARRIER: This Red LED will be On when there is no valid signal present at the module input.
SIGNAL WEAK: This Yellow LED will be On when the cable equalizer detects that the cable length is
greater than a preset threshold. (Factory set for 125 meters of Belden 1694 or
equivalent cable). See section 5.2 for information on adjusting the cable equalizer
warning threshold.
LASER FAULT This Red LED will be On when there is a fault in the optical output device.

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3 2405EO-HD-9
5. USER CONTROLS
The 2405EO-HD is equipped with a 4 position DIP switch to allow the user to configure the module. The
On position is down, or closest to the printed circuit board. Table 5-1 gives an overview of the DIP switch
functions.
DIP Switch Function
1 Reclock Mode Selection
2
3
4
Future Use
Table 5-1: DIP Switch Functions
5.1. SELECTING RECLOCK OR NON-RECLOCK MODE
DIP switch 1 determines whether the module will operate as a reclocking distribution amplifier with SMPTE
292M (1.5 Gb/s) video signals or as a non-reclocking distribution amplifier with other data rates as shown
in Table 5-2.
DIP 1 FUNCTION DESCRIPTION
Off Reclock
(default) The 2405EO-HD will reclock 1.485 Gb/s video signals.
On Non-reclock The 2405EO-HD will act as a non-reclocking distribution amplifier
for signals in the 19.4 Mb/s to 1.485 Gb/s frequency range.
Table 5-2: Reclock Mode Switch Setting
5.2. SETTING THE EQUALIZER WARNING THRESHOLD
The EQ Adj. trimpot (accessible by removing the top cover of the module) is used to set the threshold of
the cable equalizer warning. The equalizer warning is factory set to 125 meters of Belden 1684 cable, but
may be adjusted for other cable types or cable lengths. To adjust the cable equalizer warning threshold,
connect a signal to the input of the module using the required length of cable. Adjust the trimpot slowly
until the Weak Signal warning LED comes on. You can verify that the equalizer warning is operating
correctly by removing a few meters of cable from the input. The LED should go off.

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
2405EO-HD-10 Revision 1.3
6. FIBER OPTICS SYSTEM DESIGN
Fiber optics is best known for its applications in the telephone industry, even though it is widely used in
video and television systems. In television systems they typically send signals between two locations or
distribute the same signal to many destinations.
Traditional video distribution systems have used coaxial copper cabling. Fiber optic cable provides many
advantages over traditional copper wire:
• Lower cable losses allow longer distances without distribution amplifiers
• Ability to carry higher data rate signals
• Improved signal quality
• Immunity from electro-magnetic radiation and Lightning
• Light Weight
The crucial difference between fiber optic distribution systems and coaxial cable systems is that signals
are transmitted as light. The two key elements of optical fiber are its core and its cladding. The core is the
inner part of the fiber, through which the light is guided. The cladding surrounds the core completely. The
refractive property of the cladding is higher than that of the core, so light in the core that strikes the
boundary with the cladding at a glancing angle, is totally reflected back into the core. The boundary of the
core and cladding acts like a “cylindrical mirror”, causing the core to act as a light pipe.
Electrical Signal
on coax O to E RCLK Coax DrvrEQ RCLK E to O Optical Signal
on fiber Electrical Signal
on coax
Figure 6-1: Components of a Fiber Optic Transmission System
The role of an optical transmitter is to convert an electrical data signal into an equivalent optical power
waveform and couple it into an optical fiber. The role of the optical fiber is to convey the light from the
source to the destination with the minimal amount of signal loss. The role of the optical receiver is to
convert the optical power waveform back into an equivalent electrical data signal.

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3 2405EO-HD-11
6.1. SYSTEM DESIGN PARAMETERS
6.1.1. Electrical to Optical Parameters
In optical output devices, the main design parameters that are important are the launched output power,
the wavelength and the linewidth. Launch power and wavelength are always important in system designs.
Line width is usually important only in high definition applications.
6.1.1.1. Transmitter Output Launch Power
The launched output power tells us the maximum power available at the optical transmitter. Table 6-1
indicates the launched output power available on current Evertz EO modules.
Module Minimum
Launch Power Wavelength Spectral width of Optical Signal
2405EO3F -7.5 dBm 1310 nm 5 nm
2405EO3F-HD -7.5 dBm 1310 nm 5 nm
2405EO3D-HD 0 dBm 1310 nm 0.8 nm
2405EO5D-S 0 dBm 1550 nm 0.8 nm
2405EO5D-HD 0 dBm 1550 nm 0.8 nm
2405EOxx 0 dBm 1470 to 1610 nm * 0.8 nm
2405EOxx-HD 0 dBm 1470 to 1610 nm * 0.8 nm
* xx= 47 (1470 nm), 49 (1490 nm), 51 (1510 nm), 53 (1530 nm), 55 (1550 nm), 57 (1570 nm), 59 (1590 nm), 61 (1610 nm)
Table 6-1: Launch Power
6.1.1.2. Wavelength
The wavelength of the optical signal determines the cable loss window within which the system will
operate.
The loss versus wavelength graph in Figure 6-2 shows that at 1310nm the cable loss is 0.40dB/km and at
1550nm the loss is 0.30dB/km.

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
2405EO-HD-12 Revision 1.3
Loss (dB/km)
1310 1550
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Wavelength (nm)
Figure 6-2: Cables Losses at Various Wavelengths
6.1.1.3. Linewidth
The linewidth is a measure of the laser’s spectral purity, and determines the jitter penalty (how much jitter
gets added to the signal). Linewidth is important in HD applications because the additional jitter penalty is
significant compared to the bit period. In standard definition video applications linewidth is usually not a
problem because the signal will lose too much power before it can go far enough for jitter to be a problem.
At 1310nm the jitter penalty is approximately 2.5psec/km of fiber /nm of linewidth. At 1550nm the jitter
penalty is approximately 17ps/km of fiber/nm of linewidth.
Wavelength
dB
03 dB
∆λ ≤ 0.8 nm
Figure 6-3: Spectrum of DFB Laser used in EO3D-HD, EO5D-HD and EOxx-HD

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
Revision 1.3 2405EO-HD-13
Wavelength
dB
03 dB
∆λ ≤ 5 nm
Figure 6-4: Spectrum of FP Laser used in EO3F and EO3F-HD
6.1.2. Optical to Electrical Parameters
In Optical input devices, the main design parameters that are important are the maximum power before
overload and the minimum power before errors (Sensitivity). Table 6-2 indicates the maximum power and
sensitivity on current Evertz OE modules.
Module Maximum Input Power Sensitivity
2405OE 0 dBm -30 dBm
2405OE-HD -3 dBm -17 dBm
Table 6-2: Optical Receiver Power Parameters
6.1.3. Passive Optical Module Parameters
In passive optical modules, the main design parameter that is important is the loss through the passive
device. Table 6-3 indicates the power loss on current Evertz 7705 series passive fiber modules.
Module Port Insertion Loss
7705WDM < 2 dB
1310nm < 2 dB
7705WDM 1550nm < 3 dB
7705CWDM-M4 < 3 dB
7705CWDM-D4 < 3 dB
7705CWDM-M8 < 6 dB
7705CWDM-M8 < 6 dB
7705DS < 4 dB
7705DS-8 < 11 dB
80 % < 2 dB
7705MS 20 % < 9 dB
Table 6-3: Passive Module Insertion Loss

2400 Series Fiber Converter Manual
2405EO-HD SMPTE292M Re-Clocking Electrical to Fiber Converter
2405EO-HD-14 Revision 1.3
6.2. DESIGN EXAMPLES
6.2.1. Standard Definition 2 km Link
2 km x 0.4 = 0.8 dB
EO13 7705OE
Using the 2405EO3F as the transmitter.
Launch Power = -7.5 dBm
Connector Loss = 2 x 1 -2.0 dB
Fiber Loss = 2 x 0.4 -0.8 dB
Safety Margin = -2.0 dB
Power at receiver –12.3 dBm
The 2405OE has a listed sensitivity of –30 dBm which is lower than –12.3 dBm so we can implement the
system with no problems, at least with respect to power availability.
Next we need to check the jitter penalty. The system jitter-penalty = 2.5 ps/ x 2 km x 5 nm = 25 ps. By
going through 2km of fiber, we add 25ps of jitter under the worst conditions (under the best conditions we
would add 2ps total). The standard definition video bit period is 3.7 ns; so if the maximum jitter penalty is
20% or 740 ps., then the added jitter for this system is insignificant.
When would jitter-penalty be a problem? For 1310 nm wavelengths, the cable length where the jitter
penalty becomes significant is calculated as: 740 ps divided by 2.5 ps/km/nm divided by 5 nm = 60 Km
(worst case), or 600 Km (normal condition). At 60 Km cable length the cable loss is 60 x 0.4 = 24 dB.
Therefore, the power into the receiver would be: – 6 dBm – 24 dB = – 30 dBm. This is equal to the
published specification of -30 dBm but leaves no margin for connector or other losses. The jitter penalty at
1550 nm for standard definition video is calculated as: 740 divided by 17 divided by 0.8 = 54 Km (worst
case). At 54 Km cable length the cable loss is 54 x 0.3 = 16.2 dB. So the power into the receiver would
be: - 0 dBm – 16.2 dB = - 16.2 dBm. This is above the published specification of -30 dBm, therefore
added jitter may become significant on cable lengths approaching 54 Km at 1550 nm.