Optical waveguides – With optical coupler – Input/output coupler
Patent
1993-02-05
1994-05-10
Lee, John D.
Optical waveguides
With optical coupler
Input/output coupler
359341, 359563, 359569, 385 37, G02B 632
Patent
active
053116062
ABSTRACT:
In an optical filter to be used for signal selection, removal of noise, equalizing the wavelength of signal light, etc. in an optical communication system, optical measurement device or the like, and in an optical amplifier employing such optical filter, signal light is dispersed at different angles according to each wavelength by a diffraction grating and the dispersed light is selectively transmitted or reflected by a transmission type spatial filter or reflection type spatial filter, and is then coupled with an output fiber bundle as non-dispersed light by the diffraction grating. Thus, the optical filter has variable wavelength pass band characteristics and the optical amplifier possesses a uniform wavelength amplification factor.
REFERENCES:
patent: 4879462 (1989-11-01), Stephens
patent: 5062705 (1991-11-01), Sato et al.
M. Tachibana et al., "Erbium-Doped Fiber Amplifier with Flattened Gain Spectrum", IEEE Photonics Technology Letters, vol. 3, No. 2, Feb. 1991 pp. 118-119.
Kazuo Hagimoto, "Long-Span Gigabit/s Optical Transmission Systems Using Er-doped Fiber Amplifiers", NTT Transmission Systems Laboratories, pp. 23-28, (no date).
Asakura Hiroyuki
Iida Masanori
Miwa Tetsuji
Lee John D.
Matsushita Electric - Industrial Co., Ltd.
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