Dynamic gain equalizer

Details Dynamic gain equalizer Dynamic gain equalizer

2006-12-05

2006-12-05

Lee, John D. (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling structure

C385S003000, C385S024000, C385S027000, C359S337100, C398S161000

Reexamination Certificate

active

07146079

ABSTRACT:
The dynamic gain equalizer for flattening a gain profile of an optical amplifier includes: an optical waveguide circuit having multistage optical couplers, demultiplexing and multiplexing, each formed by connecting optical couplers arranged at a plurality of stages; and optical connecting circuits including optical phase shifters each capable of changing a phase of propagating light and optical delay lines each for adding a predetermined delay time to the propagating light, said dynamic gain equalizer in which at least one of the optical couplers in the two multistage optical couplers are provided with variable optical amplitude means, respectively, and each of the multistage optical couplers are formed asymmetrically with respect to an extension of a line which connects a center arranged position of optical outputting ends of the demultiplexing multistage optical coupler with a center arranged position of optical inputting ends of the multiplexing multistage optical coupler.

REFERENCES:
patent: 5351317 (1994-09-01), Weber
patent: 6344914 (2002-02-01), Shimojoh et al.
patent: 6411417 (2002-06-01), Roberts et al.
patent: 2002/0054726 (2002-05-01), Fondeur et al.
patent: 1 286 192 (2003-02-01), None
Inoue et al, “Tunable Gain Equalization Using A Mach-Zehnder Optical Filter In Multistage Fiber Amplifiers”, IEEE Photonics Technology Letters, vol. 3, No. 8, Aug. 1991, pp. 718-720.
Takashi Saida, et al., Dynamic gain equalization filter based on PLC-type optical transversal filter, The Institute of Electronics, Technical Report of IEICE, vol. 102, No. 288, Aug. 23, 2002; pp. 19-23.
T. Mizuno, et al., “Dispersionless Interleave Filter Based on Transversal Structure”, The Institute of Electronics, Information an Electronics Society, Aug. 20, 2002, p. 184.

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