td oa10, oa15, oa17, oa20lason/01_td/38_td-oa_s.pdf · in-line amplification on single-fiber ....

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

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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

Transmode Systems AB © 2009 Transmode Systems AB Box 42114 All rights reserved. No part of this document SE-126 14 Stockholm may be reproduced without written Home page: www.transmode.com SWEDEN permission of the copyright holder



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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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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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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 un-amplified 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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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 Pre-amplifier. 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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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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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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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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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 non-volatile 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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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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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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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.




© 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

W 11 4 5 11 20 14 27

Depending on operating mode and ambient temperature

Table 2: Optical data

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)

dBm NA NA -25 to +8

Gain @ Optimum gain flatness

dB 13 NA

(23)

26

Settable gain dB 5 – 30 5-30 13 – 30 in LI

13-28 in HI

Nose figure dB < 6.2 <6.2 < 5.5

Monitor port NA NA -20

Parameter Unit OA10FG OA17 OA20LG Max output power dBm 10 16.7 19.5

Min output power dBm -15 -7 -7

Input power range ( LI- Low input range) dBm NA -35 to -5 -31 to -1

Input power range ( HI- High input range)

dBm -35 to -3 -25 to +8 -25 to +5

Gain @ Optimum gain flatness

dB 20 23 22

Settable gain dB 13 – 30 13 - 30 in LI

13-28 in HI

13 – 29

Nose figure dB < 5.5 < 5.5 < 5.5

Monitor port -20 -20 -20

Note: For OA10 and OA15 the Input power range is depending on the “LOS of signal threshold” setting. Min range = LOS-3dB and Max range= LOS+27dB. For OA17/OA20 the input signal can be detected at -40, however with lower accuracy. Therefore a default LOS threshold is set at -37dBm and it is recommended to use at -35 to -5 dBm




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Table 3: Revision data

Product number Rev Release

R1A A1.2 1st released version.

A3.2 HW-change to enable new OA modelling. New overlay, OA10C R1B

10.0 LTB set for FEB 2008 R1A A2.0 1st released version.

A3.2 New overlay. Corrected port numbering on overlay. HW-change to enable new OA modelling

OA10/10C R1B

9.0 Terminated. No units delivered. R1A A2.2 1st released version.

R1B A3.2 HW-change to enable new OA modelling. New overlay OA15C

A4.1 Terminated R1A A2.2 1st released version.

R1B A3.2 HW-change to enable new OA modelling. New overlay. Corrected port numbering on overlay

OA15/15C

A4.1 Terminated R1A A4.0 1st released version. R2A A5.0 PCB corrections OA17C R2B

Introduction of temperature stabilized EDFA module

R1A A4.0 1st released version. R2A A5.0 PCB corrections OA2-17/17CC R2B

Introduction of temperature stabilized EDFA module

A4.0 1st released version. OA17POW R1A A4.1 Terminated OA20C R1A A6.0 1st released version.

OA2-20/20/CC R1A A6.0 1st released version.

OA10C/FG R1A 10.0 1st released version

OA20C/LG R1A 10.0 1st released version

OA2-20/20/CC/LG R1A 10.0 1st 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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