Optical time division demultiplexing apparatus and demultiplexed

Details Optical time division demultiplexing apparatus and demultiplexed Optical time division demultiplexing apparatus and demultiplexed

1997-07-15

2000-09-12

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359139, 359128, 359138, H04J 1408, H04J 1402

Patent

active

061185647

ABSTRACT:
The invention provides an optical time division demultiplexing apparatus which can perform optical time division demultiplexing while compensating for an operating point drift of an optical time division multiplex signal. The optical time division demultiplexing apparatus includes a clock signal generation element for generating a clock signal for optical time division demultiplexing processing of a received optical signal, and an optical switch for time division demultiplexing the optical signal based on the clock signal from the clock signal generation element. The optical time division demultiplexing apparatus further includes an operating point stabilization control circuit for superposing a predetermined low frequency signal set in advance on the clock signal for optical time division demultiplexing processing to be supplied to the optical switch and controlling the clock signal to be supplied to the optical switch based on a phase difference between a component of the predetermined low frequency signal of the optical signal after time division demultiplexing processing by the optical switch and a component of the predetermined low frequency signal set in advance so that an operating point of the optical switch on an operation characteristic may be a fixed position.

REFERENCES:
patent: 4991975 (1991-02-01), Alferness et al.
patent: 5909297 (1999-06-01), Ishikawa et al.

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