Enhanced C-Band Optical Amplifier for the Cisco ONS 15454 Multiservice Transport
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Updated:Jan 14, 2008
The Cisco® ONS 15454 Multiservice Transport Platform (MSTP) provides a comprehensive, intelligent dense wavelength-division multiplexing (DWDM) solution for expanding metropolitan (metro), regional, and long-haul bandwidth.
The Cisco ONS 15454 MSTP offers an enhanced optical amplifier card (Figure 1) operating in the C-band region of the optical spectrum to extend the reach and capacity of a metro, regional, or long-haul network. The optical amplifier cards are part of the Cisco ONS 15454 MSTP intelligent DWDM architecture engineered to reduce DWDM complexity and speed the deployment of next-generation networking solutions.
The Cisco ONS 15454 enhanced optical amplifier card is a plug-in module that takes advantage of the proven Cisco ONS 15454 carrier-class features. This card delivers the reach and optical performances to support a single DWDM channel all the way to 80 channels today, to meet the requirements of service provider and enterprise networks. Table 1 outlines the C-band optical amplifier plug-in card types available for the Cisco ONS 15454 MSTP with the applications they are designed to support.
Figure 1. Cisco ONS 15454 Enhanced C-Band Optical Amplifier (OPT-AMP-C)
Table 1. C-Band Optical Amplifier Cards with Applications
Enhanced optical amplifier (OPT-AMP-C)
This flexible amplifier can be used as a preamplifier or as a booster amplifier, providing a total output power of 20 dBm. It integrates an optical service channel splitter/combiner to allow the optical supervisory channel (OSC) to be sent to and received from the optical service channel module (OSCM) card. It employs a two-stage amplifier design to allow insertion of dispersion-management devices to compensate for pulse spreading at higher multiplexer speeds.
Deployment locations include any site where high per-channel power or high optical gain is required.
Enhanced optical booster amplifier (OPT-BST-E)
This product amplifies the outgoing composite DWDM signal to overcome the attenuation of the fiber network, providing a total output power of 20 dBm. It integrates an optical service channel splitter/combiner to allow the OSC to be sent to and received from the OSCM card.
Deployment locations include any site where high per-channel power is required to hit the fiber span.
Optical booster amplifier (OPT-BST)
This product amplifies the outgoing composite DWDM signal to overcome the attenuation of the fiber network, providing a total output power of 17 dBm. It integrates an optical service channel splitter/combiner to allow the OSC to be sent to and received from the OSCM card.
Deployment locations include any site where amplification of the DWDM signals is required before hitting the fiber span.
17 dB gain optical amplifier (OPT-AMP-17C)
This flexible amplifier can be used as a preamplifier or as a booster amplifier, providing a total output power of 17 dBm. It integrates an optical service channel splitter/combiner to allow the OSC to be sent to and received from the OSCM card. It employs a single-stage amplifier design to optimize the noise figure and operates with a fixed gain of 17 dB.
Deployment locations include any site where fixed gain amplification can be used to optimize node gain figure and dispersion-management devices are not needed.
Optical preamplifier (OPT-PRE)
This product amplifies the incoming composite DWDM signal to allow a sufficient optical power level to optical receivers on dropped wavelengths and to overcome the insertion losses of the reconfigurable or fixed optical filters in the node. It employs a two-stage amplifier design to allow insertion of dispersion-management devices to compensate for pulse spreading at higher multiplexer speeds, providing a total output power of 17 dBm.
Deployment locations include any site where variable gain amplification and/or dispersion-management devices are required in the receive direction.
The OPT-AMP-C takes advantage of the latest in amplifier technology, variable optical attenuators, photo diodes, and extensive software to facilitate a high degree of automation for simplified operations. The OPT-AMP-C features low-noise-gain blocks for C-band optical amplification requirements. For flexibility of application support, the amplifier can be used either as a pre-amplifier or as a booster amplifier. When used as a booster amplifier, the integrated OSC splitting and combining capability allows the OSCM unit to provide visibility and manageability of all the nodes of the network. The amplifier also provides fast-transient suppression to respond quickly to network changes without impairments and degradation of existing wavelengths. The amplifier integrates a software-controllable variable optical attenuator (VOA) to provide gain tilt control capabilities and to optimize the mid-access loss between the two amplification stages when different dispersion compensation units (DCUs) are used. The OPT-AMP-C provides optical safety functionality using the signal and OSC loss detection to help ensure user safety when operating the network, and complies with international standard requirements.
The flexibility provided by the OPT-AMP-C card and the possibility to configure it through software to operate as a preamplifier or as a booster amplifier greatly simplify the operation of the Cisco ONS 15454 MSTP and reduce the number of spare units to be kept by the users. Midstage access loss (MAL) provided by the OPT-AMP-C card can be used, when the card is used as a booster amplifier, to perform chromatic dispersion precompensation at the transmit location, improving overall system performances - especially with high (such as 10 Gbps) and very high (such as 40 Gbps) bit rates and services.
The optical amplifier card incorporates faceplate-mounted LEDs to provide a quick visual check of the operational status at the card. Printed on each of the faceplates is an icon, an orange circle, which is mapped to shelf-slot icons indicating the shelf slot where the card can be physically installed. The card is supported by the integrated Cisco Transport Controller craft manager on the Cisco ONS 15454, which provides the user access for operations, administration, maintenance, and provisioning (OAM&P) for the system.
Selection and deployment of the Cisco ONS 15454 Enhanced C-Band Optical Amplifier (OPT-AMP-C) depend on the requirements of the network. The Cisco Transport Planner optical design tool is available to assist in the engineering, bill-of-material development, and deployment of the DWDM network. Figure 2 shows the block diagram of the OPT-AMP-C. Figure 3 shows a sample signal-flow diagram for an Optical Line Amplifier (OLA) site using OPT-AMP-C units while Figure 4 shows a signal flow diagram for a Reconfigurable Optical Add/Drop Multiplexer (ROADM) site.
Figure 2. OPT-AMP-C Block Diagram
Figure 3. Cisco ONS 15454 MSTP OLA Site Signal Flow when OPT-AMP-C is Used
Figure 4. Cisco ONS 15454 MSTP ROADM Site Signal Flow when OPT-AMP-C is Used
Table 2 gives regulatory compliance, Table 3 gives system requirements, and Tables 4 and 5 provide card and optical specifications for the Cisco ONS 15454 Enhanced C-Band Optical Amplifier.
15454-SA-HD or 15454-SA-HD-DDR shelf assembly with CC-FTA version fan-tray assembly
15454E-SA-ETSI shelf assembly with CC-FTA version fan-tray assembly
Release 8.5 ANSI or later
Release 8.5 ETSI or later
1 to 6 and 12 to 17
1 to 6 and 12 to 17
Table 4. Card Specifications
Signal fail (SF)
Card power draw
Weight (not including clam shell)
1.4 kg / 3.08 lbs
23 to 131°F (-5 to 55°C)
5 to 95% noncondensing
-40 to 185°F (-40 to 85°C)
5 to 95% noncondensing
-40 to 158°F (-40 to 70°C)
5 to 95% noncondensing
Table 5. Optical Specifications
1529.0 to 1562.5 nm
Input power range
-15 to 8 dBm (full channel load)
-40 to -17 dBm (single channel)
Channel output power range
-5 to 20 dBm
Maximum total output power
Channel signal-spontaneous noise figure
5.5 dB with gain = 35 dB
6.5 dB with gain ≥ 24 dB
Pump leakage to input/output
Maximum reflectance tolerable at input
Maximum reflectance tolerable at output
Channel addition/removal (steady-state) gain response
Between 5 ms and 1 second
Channel addition/removal (transient) gain response
0.5 ms (3 dB input power excursion, maximum undershoot and overshoot < 1.8 dB)
0.19 ms (3 dB input power excursion, maximum undershoot and overshoot < 1.8 dB)
Between 12 dB and 35 dB
Multichannel gain variation (inter-channel gain difference)
Multichannel gain tilt
0 dB (gain ≤ 24 dB)
Maximum 1 dB (gain ≥ 25dB)
Maximum Polarization Mode Dispersion (PMD)
Tables 6 gives ordering information for the Cisco ONS 15454 Enhanced C-Band Optical Amplifier card.
Table 6. Ordering Information
Enhanced optical amplifier, 20 dBm output power, can be configured as preamplifier or booster, C-band, 80 channel, 50-GHz compatible, LC connectors, midstage access, includes one 4-dB LC/LC attenuated loopback (to be used if DCU is not required) and two 2-meter LC/LC fiber-optic cables
1All compliance testing and documentation may not be completed at release of the product. Check with your sales representative for countries outside of Canada, the United States, and the European Union.