700-0023-05-00 Rev. 1 © 2013 Cyan, Inc. – All Rights Reserved. Page 145
Chapter 3: Optical Link Design
This section describes optical link design for the Cyan Z-Series LAD modules.
In This Chapter
DWDM XFP Specifications with GFEC ............................................... 145
LAD Modules ........................................................................................ 146
Dispersion Compensation Modules ....................................................... 151
3.1 DWDM XFP Specifications with GFEC
The following is the list of typical 80 km DWDM XFP specifications with OTU2 Generic Forward Error
Correction (GFEC) functionality. The error correction provided by GFEC improves minimum Rx
sensitivity by 3 dB, to -27 dBm from -24 dBm.
Parameter Max Min Notes
Transmit Power (TXP) +3 dBm -1 dBm
Rx Sensitivity (RXP) -7 dBm -27 dBm @ 10e-12 BER
Power Penalty (Po) 3 dB @ 80 km
Attenuation 23 dB 10 dB
Approximate Distance 80 km
Max Attenuation = TXP (min) – RXP (min) – Po
Min Attenuation = TXP (max) – RXP (max)
Approximate Distance = Max Attenuation / 0.2875 dB/km
Note: This section assumes the use of Cyan standard 80 km DWDM XFP transceivers in all cases.
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