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Cisco ONS 15454 DWDM Engineering and Planning Guide, Release 7.x
July 2006
Chapter2 Cards Specifications 2.2.3 Optical Add and Drop Cards
2.2.3.2 32WSS-L Card
The 32WSS-L card is capable of operating bidirectionally over the L band of the optical spectrum
(wavelengths from 1577 nm to 1605 nm).
In one line direction, the EXP-RX port receives the aggregate optical signal. The first arrayed
wavelengthgrating (AWG) opens the spectrum and each wavelength goes through a 1x2 optical switch,
where the same wavelength can be added from its ADD port. A dedicated per-channel VOA allows
per-channel power regulation. The second AWG multiplexes all the wavelengths and the aggregate
signal goes through the COM-TX output port.
In the other line direction, the aggregate optical signal comes in from the COM-RX port. An 80/20
splitter (80 Express/20 Drop) sends the optical signals on two output ports, the DROP-TX port for
demultiplexing and dropping wavelengths, and the EXP-TX port for the next stage.
Each input and output port is equipped with either a real or a virtual photodiode. All VOAs for the
32 channels and switches are software-controlled for remote reconfiguration. Table2-9 defines all
optical internal parameters and performances details.
Directivity Add1,32 <=> Add 1,32 40 — — dB
Add 1, 32 <=> EXP RX
Return loss — 40 — — dB
Maximum optical input
power — 300 — — mW
Maximum AWG startup
time — — — 10 min.
Table2-8 32WSS Card Parameters and Performance (continued)
Parameter Condition Min Typical Max Unit
Table2-9 32WSS-L Card Parameters and Performance
Parameter Condition Min Typical Max Unit
–0.5 dB bandwidth EXP RX => COM TX +/–91 116 — pm
–0.5 dB bandwidth Add 1, 32 => COM TX +/–135 161 —
Insertion loss EXP RX => COM TX — 9.7 11.3 dB
COM RX => EXP TX — 1.4 1.6
Add 1, 32 => COM TX — 6.2 8.0
COM RX => DROP TX 6 8 8.5
Adjacent crosstalk Add 1, 32 23 30 — dB
Multi path interference EXP RX => COM TX 41 49 —
Nonadjacent crosstalk Add 1, 32 30 42 —
PDL EXP RX => COM TX — 0.5 0.9 dB
COM RX => EXP TX — 0.5 0.9
Add 1, 32 => COM TX — 0.7 1.5
COM RX => DROP TX — 0.7 1.3