Optical channel monitor

Details Optical channel monitor Optical channel monitor

2002-05-31

2008-12-09

Chan, Jason (Department: 2613)

Optical communications

Multiplex

Wavelength division or frequency division

C398S083000, C398S084000, C398S085000, C398S086000, C398S088000, C398S029000, C359S634000, C359S635000, C359S636000, C359S017000, C359S213100, C359S214100

Reexamination Certificate

active

07463828

ABSTRACT:
An optical channel monitor is provided that sequentially or selectively filters an optical channel(s)11of light from a (WDM) optical input signal12and senses predetermined parameters of the each filtered optical signal (e.g., channel power, channel presence, signal-noise-ratio). The OCM10is a free-space optical device that includes a collimator assembly15, a diffraction grating20and a mirror22. A launch pigtail emits into free space the input signal through the collimator assembly15and onto the diffraction grating20, which separates spatially each of the optical channels11of the collimated light, and reflects the separated channels of light onto the mirror22. A λ/4 plate26is disposed between the mirror22and the diffraction grating20. The mirror reflects the separated light back through the λ/4 plate26to the diffraction grating20, which reflects the channels of light back through the collimating lens18. The lens18focuses each separated channel of light (λ1-λN) at a different focal point in space. One of the optical channels11is focused onto a receive pigtail28, which then propagates to a photodetector30. A pivoting mechanism34pivots the diffraction grating20or mirror22about a pivot point36to sequentially or selectively focus each optical channel11to the receive pigtail28. A position sensor42detects the displacement of the diffraction grating24or mirror.

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