Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-01-07
1999-06-15
Mullen, Thomas
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359154, 359161, 359173, 359341, H04J 1402
Patent
active
059127503
ABSTRACT:
Wavelength multiplexed optical signals which are input into a first optical amplifier from an optical transmission terminal device over an optical fiber are differently amplified in respective wavelengths due to unevenness of gain of the optical amplifiers and then output. By providing M-transmission optical filters having an M-type transmission characteristic to cancel gain deviation of the optical amplifiers in respective wavelengths, a flat gain characteristic can be achieved even after the optical signals are transmitted via a plurality of optical amplifiers and a plurality of M-transmission optical filters. Also, by removing ASE in a wavelength range of 1.53 .mu.m which prevents signal amplification in a wavelength range of 1.55 .mu.m, the wavelength multiplexed optical signals which are sufficiently amplified can be transmitted to an optical reception terminal device over the optical fiber.
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IEEE Photonics Technology Letters, vol. 3, No. 8, pp. 718-720, "Tunable Gain Equalization Using a Mach-Zehnder Optical Filter in MultistageFiber Amplifiers", Aug. 1991, Inoue, et al.
OFC'95, Technical Digest, TuPl, 1995, pp. 77-78, "Gain-Flattened Optical-Fiber Amplifiers with a Hybrid Er-doped-fiber configuration for WDM Transmission", Kashiwada, et al.
Akiba Shigeyuki
Miyakawa Takayuki
Taga Hidenori
Takeda Noriyuki
Yamamoto Shu
Kokusai Denshin Denwa Kabushiki-Kaisha
Mullen Thomas
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