Cisco ONS 15454 DWDM - OPT-PRE Amplifier

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Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
April 2006
Chapter 16 Card Reference
16.5.1 OPT-PRE Amplifier
16.5.1 OPT-PRE Amplifier
This section describes the OPT-PRE amplifier card. The OPT-PRE is designed to support 64 channels at
50-GHz channel spacing, but is currently limited to 32 channels at 100 GHz. The OPT-PRE is a C-band
DWDM, two-stage erbium-doped fiber amplifier (EDFA) with mid-amplifier loss (MAL) for allocation
to a DCU. To control the gain tilt, the OPT-PRE is equipped with a built-in VOA. The VOA can also be
used to pad the DCU to a reference value. You can install the OPT-PRE in Slots 1 to 6 and 12 to 17.
The OPT-PRE features:
• Fixed gain mode with programmable tilt
• True variable gain
• Fast transient suppression
• Nondistorting low-frequency transfer function
• Settable maximum output power
• Fixed output power mode (mode used during provisioning)
• MAL for fiber-based DCU
• Amplified spontaneous emissions (ASE) compensation in fixed gain mode
• Full monitoring and alarm handling with settable thresholds
• Four signal photodiodes to monitor the input and output optical power of the two amplifier stages
through CTC
• An optical output port for external monitoring
Note The optical splitter has a ratio of 1:99. The result is that the power at the MON port is about 20 dB lower
than the power at the COM TX port.