Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-10-02
2000-01-25
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359110, 359134, H04B 1002
Patent
active
06018406&
ABSTRACT:
To effectively collecting information necessary for maintenance of the optical transmission system from each optical repeater equipment, in an optical transmission system of the wavelength division multiplexing type according to this invention, a repeater unit 210-1 in optical repeater equipment 200 detects the wavelengths of optical signals .lambda.1 to .lambda.q', the directions of optical signals, the transmission line ID Nos., and so on by using an optical couplers 211, 219, demultiplexers 212, 213, O/E converters 214-1.about.p, 215-1.about.q, and local oscillators 216-1.about.p, 217-1.about.q, and a supervisory control signal, including information about the detection results and a light amplifier 218, is sent to optical terminal equipment 100.
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"In-Service Supervisory EDFA-Repeated Wavelength Division Multiplexing Transmission System"; Y.K. Chen et al.; IEEE Photonics Technology Letters, vol. 7, No. 8; Aug. 1, 1995, New York; pp. 923-925.
Patent Abstract of Japan, English-language Abstract of JP 07/202306A (Aug. 4, 1995), vol. 095, No. 011, published Dec. 26, 1995.
Ishimatsu Hirokazu
Watanabe Takashi
Negash Kinfe-Michael
OKI Electric Industry Co., Ltd.
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