Method and device for optical add/drop multiplexing using high s

Details Method and device for optical add/drop multiplexing using high s Method and device for optical add/drop multiplexing using high s

1997-04-04

1999-07-06

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359122, 359156, 359161, 385 24, H04J 1402

Patent

active

059204133

ABSTRACT:
An optical add/drop multiplexing scheme capable of reducing the degradation of the transmission characteristic due to the beat noises caused by the interference of the fiber grating leakage components. An optical add/drop multiplexing device is formed by a high speed polarization scrambler for entering signal lights with a data modulation at a high speed bit rate applied thereto, and scrambling polarization states of entered signal lights at high speed, and an optical add/drop element for receiving the signal lights with the polarization states scrambled by the high speed polarization scrambler, and carrying out an add/drop multiplexing operation for signal lights in a specific wavelength among received signal lights. The high speed polarization scrambler scrambles the polarization states of the entered signal lights so as to lower a probability for having worst polarization states of signal lights and interference lights, by scrambling the polarization states of the entered signal lights into every possible polarization states at nearly equal probabilities.

REFERENCES:
patent: 5611005 (1997-03-01), Heismann et al.
patent: 5717795 (1998-02-01), Sharma et al.
patent: 5754321 (1998-05-01), Giles et al.
LOOC '95 Hong Kong FD1-2 (Integrated Optics and Optical Fiber Communication) abstract of Polarization Scrambling and Multiplexing in Optically-Amplified Transoceanic Communication Systems, by Fred Heismann pp. 92 to 93.

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