TD_OA10, OA15, OA17, OA20

TM-Series
Technical Description
Optical Amplifier Units
OA10C/FG R1 OA10C R1
OA17C R1 OA2-17/17CC R1
OA20C R1 OA2-20/20CC R1
OA20C/LG R1 OA2-20/20/CC/LG R1
Rev S, 2009-11-30
Class 1M
Products

IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 2 (15)
Table of Content
1 General...............................................................................................................3
1.1 In commercial confidence ...............................................................................................3
1.2 Document Revision History.............................................................................................3
2 Functional Description........................................................................................4
2.1 General description.........................................................................................................4
2.2 Applications.....................................................................................................................6
2.2.1 Off-line amplification on single-fiber ................................................................................6
2.2.2 In-line amplification on fiber-pair .....................................................................................7
2.2.3 In-line amplification on single-fiber..................................................................................8
2.2.4 Line amplifier in a 1U chassis .........................................................................................9
2.3 Alarms...........................................................................................................................10
2.4 Board data ....................................................................................................................10
2.5 Remote inventory..........................................................................................................11
2.6 Consequent actions ......................................................................................................11
2.7 Monitor point .................................................................................................................11
3 Mechanical Layout ...........................................................................................12
3.1 Single OA’s ...................................................................................................................12
3.2 Dual OA’s......................................................................................................................13
4 Technical data ..................................................................................................14
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 3 (15)
1 GENERAL
The specifications and information within this manual are subject to change without further
notice. All statements, information and recommendations are believed to be accurate but
are presented without warranty of any kind. Users must take full responsibility for their
application of any products.
In no event shall Transmode Systems AB be liable for any indirect, special, consequential
or incidental damages, including, without limitation, lost profits or loss or damage to data
arising from the use or inability to use this manual, even if Transmode or its suppliers have
been advised of the possibility of such damages.
1.1 In commercial confidence
The manual is provided in commercial confidence and shall be treated as such.
1.2 Document Revision History
Revision Date Description of changes
A 2002-12-02 Creation
B 2003-03-17 Addition of dual OA Unit
C 2003-06-28 Additional details on on-line vs off-line amplification.
Optical parameter info in new table in section 4
D 2004-03-21 Addition of 15dBm variants
E 2004-10-11 R-state info added in chapter 4
F 2005-06-30 - Transition to new Transmode format.
- Introduction of new overlay with clarified text information.
- Introduction of R1B version with new OA-modeling (A3.2)
G 2005-08-24 Updated to include new OA settings
H 2005-10-31 Addition of 17dBm OA’s (A4.0 content)
I 2005-12-20 Removal of 17dBm Power amplifier. This configuration is
now a SW parameter. Phase out of 15dBm OA’s
J 2006-01-11 Clarifications on 17dBm amplifiers. Removal of chapter with
commissioning instructions (only available in I&C manual).
Added technical information.
K 2006-04-20 Update of OA17C and OA17/17CC to R2B
L 2006-06-20 - Addition of 20dBm OA’s
- Corrected power dissipation values on 17dBm OA’s
M 2006-08-01 -Technical Data table modified and completed with OA15
data
N 2007-12-21 Updated with 10.0 content
O 2008-02-11 Updated power consumption
P 2008-03-14 Change of logotype
Q 2009-02-10 New document front
Added recommendation to not activate APS (chapter 2.6)
R 2009-06-22 Updated Optical data settable gain.
S 2009-11-30 Removal of irrelevant information. Enhanced description of
different configurations. Addition of R14 content.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 4 (15)
2 FUNCTIONAL DESCRIPTION
2.1 General description
Figure 1: General block diagram of OA units
The Optical Amplifier Unit is used to amplify aggregated optical signals. The amplifier
boards can be used in three applications:
• As Pre amplifiers – To amplify wavelengths before they are connected to the receiver
side of Transponders
• As Power amplifiers – To amplify wavelengths out from Transponders to a high power
level prior to transmission
• As Line amplifiers – To amplify wavelengths at an intermediate site without electrical
regeneration.
The following EDFA amplifier types are currently provided:
• 10dBm multi-purpose (single), Product ID: OA10C/FG (replaces OA10C)
• 17dBm multi-purpose (single) , Product ID: OA17C
• 17dBm multi-purpose (dual) , Product ID: OA2-17/17CC
• 20dBm multi-purpose (single) , Product ID: OA20C
• 20dBm multi-purpose (dual) , Product ID: OA2-20/20CC
• 20dBm Opt Low Gain Amp C-Band (single); Product ID: OA20C/LG
• 20dBm Opt Low Gain Amp C-Band (dual); Product ID: OA2-20/20/CC/LG
All units are Class 1M products.
The dual amplifiers have two separate EDFA functions. They can be used independently.
The amplifiers have different gain values and gain characteristics. The selection of
amplifier type is dependent on channel count and span distance.
The 10dBm amplifier is primarily intended to be used as a pre-amplifier. The 17dBm and
20dBm amplifiers can be used as power-, line- or pre-amplifiers. In some cases a 20dBm
amplifier can be needed in one direction, but a 17dBm is enough in the other direction. For
such situations it normally is better to select a double 20dBm amplifier unit from cost
perspective.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 5 (15)
Optical amplifiers are used to regain optical power and enable bridging of distances up the
point where the chromatic dispersion sets the limit. Dispersion compensating devices
(DCU’s) can then be introduced to extend the distance to the point where optical noise etc.
have deteriorated the signal quality to a level where electrical regeneration is needed
before bridging another segment.
There are a number of other parameters that have to be taken into account when designing
amplified networks. Some examples are:
• Bit rate: The network must be designed for the highest bit rate. A link with a mix of
10Gb/s and 2.5Gb/s wavelength channels will require a different configuration
compared to a network with only 2.5Gb/s channels. The 10Gb/s channels will also
restrict the maximum distance.
• Line coding: Some transponders have FEC (Forward Error Correction) that will give
3 to 5dB better power budget compared to transponders without FEC.
• Dispersion properties: Some Transponders have “Long reach” lasers with better
dispersion properties.
• Optical noise tolerance (OSNR)
• Number of channels: A network with max 16 channels will not have the same design
solution as a network that needs to carry up to 32 channels.
To conclude; amplified networks requires more technical skills to design compared to unamplified
networks. In un-amplified networks all wavelengths are independent and it is
mostly just a matter of making power budget calculations on a per wavelength basis.
Designing amplified networks with line amplifiers requires that all wavelength channels
must be taken into consideration. It is the “worst” wavelength channel that will define the
complete network design. The placement of the amplifiers in the optical path can be done
in two ways.
• Off-line: Used in single-fiber configurations using a special AD-filter. The optical
signal(s) are amplified before/after they have been added/dropped from the line fiber.
The amplifier will thus operate on 1 or 2 wavelengths only. This is the normal setup
used in p-t-p, bus and ring topologies where passive add/drop filters are used to
add/extract wavelength channels. Amplifiers thus only need to be applied on those
wavelengths that need amplification. No intermediate line amplifiers are possible to
introduce in these configurations.
• In-line: Used in fiber-pair and single-fiber configurations. This is the traditional
placement where the amplifier is placed on the line fiber and thus operates on all
wavelengths present on the line fiber. This setup is only used in p-t-p networks where
optical MDU’s are used. Intermediate line amplifiers are possible to introduce in these
configurations
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 6 (15)
2.2 Applications
2.2.1 Off-line amplification on single-fiber
When using AD-filters for single-fiber configurations (AD1AB/xxxxx, AD1BA/xxxxx,
AD2AB/xxxxx, AD2BA/xxxxx, AD4AB/xxxxx, AD4BA/xxxxx), in-line amplification is not
possible to establish. Instead, a special 2ch AD-filter (AD2OAAB/xxxxx, AD2OABA/xxxxx)
is used enabling off-line amplification.
This AD-filter has extra ports for connecting a Power (or Booster) amplifier and/or a Preamplifier.
The wavelengths are thus amplified before and/or after they are add/dropped
from the line fiber. A network can thus be a mix of standard AD-filters without off-line
amplifiers and AD-filters enabling off-line amplification. Amplification can thus be added on
wavelengths that require amplification.
Figure 2 “Off line” amplification
Figure 2 shows a configuration using the special 2ch AD-filter (AD2OAAB/xxxxx) having
additional ports where a power amplifier and/or a pre-amplifier can be added “off-line” to
amplify this wavelength channels.
For further details on the AD2OAAB/xxxxx filters, see separate Technical Description within
the System Manual.
See “Dimensioning Guidelines” document within the System Manual for details on span
lengths.
See “OA Commissioning Guide” document within the System Manual for details amplified
networks.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 7 (15)
2.2.2 In-line amplification on fiber-pair
Figure 3 “In-line” amplification example
The above figure shows the traditional fiber-pair configuration where the amplifiers are
placed “in-line” and consequently amplifies all wavelengths on the line fiber.
An OSC channel is injected at the terminal nodes to enable management access to the
intermediate line amplifier node.
See “Dimensioning Guidelines” document within the System Manual for details on span
lengths.
See “OA Commissioning Guide” document within the System Manual for details amplified
networks.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 8 (15)
2.2.3 In-line amplification on single-fiber
Figure 4 “In-line” amplification on single-fiber example
The figure shows how an amplified link can be established on a single-fiber. MDU-E and
MDU-T is used in transmit direction (east) while MDU8-T/EVEN-C and MDU8-E/EVEN-C
are used in the receive direction (west). The optical interleaver is used to combine the two
directions onto a single-fiber. The same interleaver type is used to separate the directions
at the line amplifier site to enable amplification as well as combined the two after
amplification.
In-line amplification can thus be done also for single-fiber configurations.
An OSC channel is injected using single-fiber CWDM AD-filters to enable remote
management access to the line amplifier site.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 9 (15)
2.2.4 Line amplifier in a 1U chassis
In R14 (Dec 2009) it is possible to insert an amplifier unit in a TM-101 or TM-102 chassis
together with a 2ch VOA (VOA/2CH) as shown in the figure.
Figure 5: Compact 1U Line Amplifier NE
The 2ch VOA enables remote adjustment of the attenuation between two sites. This can be
used to provide optimum working conditions for the EDFA amplifier and also to
compensate for change in fiber attenuation due to e.g. a fiber splice.
Note that this Line Amplifier NE has no OSC channels. Remote management access must
consequently be done via a local DCN connection.
I full-fledged line amplifier NE as shown in Figure 3 will require a TM-301 chassis.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 10 (15)
2.3 Alarms
Any generated alarms are collected by the Control Unit and accessible via the node
manager TM-EMN or network manager Transmode TNM. The status LED (STS-LED) on
the board front indicates the severity of the active alarms. See chapter 3.
The generated alarms are shown in Operations & Maintenance volume of the System
Manual, “Troubleshooting Guide”.
2.4 Board data
All boards/units within a TM Network Element have unit related information stored in nonvolatile
memory banks. This information is stored at production and is required for
administration and startup of the boards.
The information is divided into three main groups:
• Environmental data - Contains data, which is read and used without knowledge of
production data version
• Generic board data - Contains administrative data, which is included on all boards,
both active and passive.
• Specific board data - Data needed for proper board operation.
Some alarms are based on the presence of this information:
• “Vital Product Data Missing”: Information in the board data memory bank that is vital to
manage the unit is missing. This alarm is classified as “major” and may require board
replacement.
• “Non-vital Product Data Missing”: Information in the board data memory bank that is
not vital to manage the unit is missing. This alarm is classified as “minor”
See System Manual Volume C, Operation & Maintenance for further details.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 11 (15)
2.5 Remote inventory
An on-board EE-PROM enables remote extraction of inventory data. The information
provided is:
• Unit name
• Unit HW Product number
• HW revision
• Unit SW product number
• SW revision
• Unit Manufacturer
• Unit serial number
2.6 Consequent actions
Figure 6: Consequent actions upon loss of input signal
The OA units have an Automatic Power Shutdown (APS) feature. This is per default set in
“disable” position. It is not recommended to activate APS on a network with multiple line
amplifiers since there is risk for the link not to come up after a failure.
APS shuts down output power when the input optical power is below a pre-defined level.
When the input optical power rises above the pre-defined level, the Optical Amplifier is
activated.
2.7 Monitor point
All amplifiers (except OA10C) have a monitor point corresponding to 1% of the output
power, corresponding to 20dB lower than the output power.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 12 (15)
3 MECHANICAL LAYOUT
3.1 Single OA’s
All single OA units have the same mechanical solution. To identify units type, see label on
top (Unit type) or on product label placed on upper handle.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 13 (15)
3.2 Dual OA’s
All dual OA units have the same mechanical solution. To identify units type, see label on
top (Unit type) or on product label placed on upper handle.
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IN COMMERCIAL CONFIDENCE
OPTICAL AMPLIFIER UNIT
Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 14 (15)
4 TECHNICAL DATA
Table 1: Electrical data
Parameter Unit max Comment
Power consumption
OA10FG
OA15
OA15/15C
OA17C
OA2-17/17CC
OA20C and OA20C/LG
OA2-20/20/CC and OA2-20/20/CC/LG
Table 2: Optical data
W
11
4
5
11
20
14
27
Depending on operating mode and
ambient temperature
Parameter Unit OA10 OA15 OA20
Max output power dBm 9 15 19.5
Min output power dBm -10 -10 -7
Input power range ( LI- Low
input range)
dBm
-43 to -13
See Note
-35 to +5
See Note
-35 to -5
See note
Input power range ( HI-
High input range)
Gain @ Optimum gain
flatness
dBm NA NA -25 to +8
dB 13 NA
Settable gain dB 5 – 30 5-30 13 – 30 in LI
(23)
26
13-28 in HI
Nose figure dB < 6.2

IN COMMERCIAL CONFIDENCE
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Date: Doc. number: Rev: Page
© Transmode 2009-11-30 TD-OA S 15 (15)
Table 3: Revision data
Product number Rev Release
R1A A1.2 1 st released version.
OA10C R1B
A3.2
HW-change to enable new OA modelling.
New overlay,
10.0 LTB set for FEB 2008
R1A A2.0 1 st released version.
New overlay. Corrected port numbering on
OA10/10C R1B
A3.2 overlay. HW-change to enable new OA
modelling
9.0 Terminated. No units delivered.
R1A A2.2 1 st released version.
OA15C
R1B A3.2
HW-change to enable new OA modelling.
New overlay
A4.1 Terminated
R1A A2.2 1 st released version.
HW-change to enable new OA modelling.
OA15/15C
R1B A3.2 New overlay. Corrected port numbering on
overlay
A4.1 Terminated
R1A A4.0 1 st released version.
OA17C
R2A
R2B
A5.0 PCB corrections
Introduction of temperature stabilized EDFA
module
R1A A4.0 1 st released version.
OA2-17/17CC
R2A
R2B
A5.0 PCB corrections
Introduction of temperature stabilized EDFA
module
A4.0 1 st OA17POW R1A
A4.1
released version.
Terminated
OA20C R1A A6.0 1 st released version.
OA2-20/20/CC R1A A6.0 1 st released version.
OA10C/FG R1A 10.0 1 st released version
OA20C/LG R1A 10.0 1 st released version
OA2-20/20/CC/LG R1A 10.0 1 st released version
Introduction of R-state R2B on 17dBm amplifiers
In release A5.0 the R-state of the 17dBm amplifiers are increased to R2B due to
introduction of a temperature stabilized EDFA module. This change is vendor induced to
provide a more generic product.
The R2B versions of the OA17C and OA2-17/17CC units are compatible with the previous
revisions. That means that they can be used as spare part or replacement for each other.
Since the temperature variations of the R2B version will be smaller than the previous
versions, the alarm and warning thresholds must be adjusted to avoid unnecessary
high/low temperature alarms.
For OA17C R2A and OA2-17/17CC R2A:
Set laserTempHighRelativeThreshold to +45.0°C
Set laserTempLowRelativeThresld to –25 (-45.0)°C
For OA17C R2B or later and OA2-17/17CC R2B or later:
Set laserTempHighRelativeThresld to +1.0°C
Set laserTempLowRelativeThresld to -1.0°C
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