Optical waveguides – With optical coupler – Plural
Patent
1998-02-27
2000-08-22
Sanghavi, Hemang
Optical waveguides
With optical coupler
Plural
385 37, 359130, G02B 628, H01J 1402
Patent
active
061084689
ABSTRACT:
In an optical transmission system, an optical branching device is in use, the number of original transmission lights decreases or level of transmission lights deteriorates for some cause or other. Since output of optical amplifier is predetermined, when the number of transmission lights reduces, level of remaining transmission light is changed, thus departing from optimum operation condition. There is provided an optical branching device including a fiber grating for reflecting light with a wave length different from transmission light, at the time of malfunction such as disconnection, it causes a light with a wave length different from the transmission light to transmit from terminal station or branching station, thus maintaining the level of the transmission light to prescribed level. When the level of the transmission lights deteriorates, it causes the level of transmission light from the branch office to be adjusted. As a result, the level of respective transmission lights is maintained to the original level so that optimum operation condition is maintained, thus the level among the respective transmission lights is capable of being adjusted.
REFERENCES:
patent: 5706375 (1998-01-01), Mihailov et al.
patent: 5726785 (1998-03-01), Chawki et al.
patent: 5748349 (1998-05-01), Mizrahi
Abstract of UK Patent Application GB 2 315 380, Noda et al, "Optical add/drop circuit using fiber gratings", Jan. 1998.
M.J. Chawki et al., "Evaluation of an Optical Boosted Add/Drop Multiplexer OBADM including Circulators and Fiber Grating Filters", Proceedings of the European Conference on Optical Communications, vol. 1, Sep. 17, 1995, XP 203255660, pp. 47-50.
T. Yamamoto et al., "High Speed Optical Path Routing by Using Four-Wave Mixing and a Wavelength Router with Fiber Gratings and Optical Circulators", vol. 120, No. 5/6, Nov. 1, 1995, pp. 245-248.
Kaneko Tomoyuki
Watanabe Seiji
NEC Corporation
Sanghavi Hemang
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