Loss of signal detection

Details Loss of signal detection Loss of signal detection

2011-05-10

2011-05-10

Liu, Li (Department: 2613)

Optical communications

Diagnostic testing

Fault detection

C398S009000, C398S018000, C398S020000, C398S033000, C398S034000, C398S097000, C398S177000, C398S180000

Reexamination Certificate

active

07941048

ABSTRACT:
An apparatus and a method for accurately detecting Loss of Optical Power (LOS) by noise power cancellation effect and optical power is measured at two output ports of an athermal periodic filter, wherein one output port in the optical frequency domain, is aligned with the signal channels of an input WDM signal (on-grid port), whereas the second output port is aligned complementary to the first output port (off-grid port). In a preferred embodiment, the apparatus computes the ratio of the measured optical powers at the two output ports of the periodic filter, and comparing them to a threshold value that is determined from the overall common-mode rejection ratio (CMRR) of the detection apparatus. In an alternative embodiment, the apparatus additionally compares the optical power measured at the on-grid port to a threshold power that is determined from system design parameters.

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Liu et al: “Athermal Optical Demodulator for OC-768 DPSK and RZ-DPSK Signals” IEEE Phtonics Technology Letters, vol. 17, No. 12, Dec. 2005, pp. 2610-2612.

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