Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-11-05
2000-09-05
Chan, Jason
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359127, 359128, 359130, H04J 1402
Patent
active
061151564
ABSTRACT:
A demultiplexer device is used in a wavelength-division multiplexed optical fiber communication line to achieve efficient dispersion compensation and loss compensation as well as a reduction of active devices such as optical amplifiers. The demultiplexer device has a series of couplers disposed in multi-stages from the input of the demultiplexer. Each coupler has two branches with one branch of each coupler connected to a separate optical filter and the other branches are series connected to a subsequent stage of the couplers through equalizing fibers, except for the final stage which has its second branch connected to an optical filter for the shortest wavelength transmitted. The equalizing fibers are thus serially connected between couplers and act to perform a cumulative dispersion compensation. The quantity of the equalizing fibers can thus be reduced as a whole, and as a result the attenuation amount also decreases, so that the number of optical amplifiers can be reduced.
REFERENCES:
patent: 5701188 (1997-12-01), Shigematsu et al.
Goto Koji
Kawazawa Toshio
Otani Tomohiro
Wakabayashi Hiroharu
Chan Jason
Kokusai Denshin Denwa Kabushiki Daisha
Singh Dalzid
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