Optical branching/multiplexing apparatus

Details Optical branching/multiplexing apparatus Optical branching/multiplexing apparatus

1997-11-24

2000-06-20

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359134, 359177, H04J 1402

Patent

active

06078413&

ABSTRACT:
In an optical branching/multiplexing apparatus, to effect harmful influence to transferring characteristic of optical signal of wavelength penetrated through an optical branching device is prevented. At the optical branching device, a specific wavelength signal is subjected to an optical-branching, while another wavelength signal with exception of the specific wavelength is penetrated in wavelength division multiplexed main input signal. Multiplexed input signal is amplified by an optical amplifier 7 with variable gain, before amplified signal is divided by a photo coupler to be applied to the optical multiplexing device and to the other hand input sides of a comparator. The comparator compares reference light penetrated through the optical branching device with multiplexed light from the photo coupler, and an exciting LD module controls the optical amplifier such that quantity of light of optical signal amplified by the optical amplifier based on an error signal of the comparator agrees with optical signal penetrated through the optical branching device.

REFERENCES:
patent: 5502589 (1996-03-01), Yamamoto et al.
patent: 5784192 (1998-07-01), Sugiyama et al.

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