Gain equalizer and optical amplification apparatus

Optical waveguides – With optical coupler – Input/output coupler

Reexamination Certificate

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Details

C385S014000, C385S010000, C385S027000, C359S341100, C398S082000, C398S084000, C398S149000, C398S160000

Reexamination Certificate

active

06952511

ABSTRACT:
The present invention is directed to a gain equalizer having a preferable equalization characteristic and a structure that can be easily fabricated. The gain equalizer flattens a spectrum of light in a predetermined wavelength range inputted through an input terminal and outputs the light from an output terminal, and comprises a coarse-tunable equalizing section and a fine-tunable equalizing section connected in series. The coarse-tunable equalizing section coarsely flattens the spectrum of the light in the predetermined wavelength range, and includes a plurality of filters each having a large loss and a small reflectance as compared with the fine-tunable equalizing section. The fine-tunable equalizing section flattens the spectrum of the light in a wavelength range where the coarse-tunable equalizing section can not flatten at a predetermined value or less among the predetermined wavelength range.

REFERENCES:
patent: 5920424 (1999-07-01), Espindola et al.
patent: 5982791 (1999-11-01), Sorin et al.
patent: 6603585 (2003-08-01), Manna et al.
patent: 6636666 (2003-10-01), Chan et al.
patent: 2004/0109638 (2004-06-01), Shigehara et al.
patent: P2002-82235 (2002-03-01), None
“Long-Period Fiber Gratings as Band-Rejection Filters”, Vengsarkar et al., IEEE, Journal of Lightwave Technology, pp. 58-65 vol. 14, No. 1, Jan. 1996.
“36 NM Amplifier Gain Equalizer Based on Slanted Bragg Grating Technology For Multichannel Transmission”, Riant et al., Suboptic 2001, P4.3.10.

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