Method for sub-carrier multiplexed optical signal transmission a

Details Method for sub-carrier multiplexed optical signal transmission a Method for sub-carrier multiplexed optical signal transmission a

1997-06-26

2000-05-23

Mullen, Thomas

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359182, H04J 1402

Patent

active

060671777

ABSTRACT:
It is the object of the invention to provide a sub-carrier multiplexed optical signal transmission system employing super wide-band frequency modulation scheme, in which the SNR of a sub-carrier of a higher sub-carrier frequency is not decreased. The intensity of a sub-carrier of a higher sub-carrier frequency is increased by a pre-emphasizer, and modulated in a FM modulator. Then, a super wide-band FM signal is obtained. The super wide-band FM signal is supplied to the transmitter laser diode, and intensely modulated to obtain an optical signal. The optical signal is transmitted through an optical fiber, supplied to an optical receiver and converted into an electrical signal. The super wide-band FM signal thus obtained is demodulated by a FM demodulator. The sub-carrier multiplexed signal is supplied to a de-emphasizer having an inverse characteristic of that of the pre-emphasizer, wherein the signal supplied thereto recovers its original frequency spectrum.

REFERENCES:
patent: 5661580 (1997-08-01), Yamada
patent: 5790289 (1998-08-01), Taga et al.
patent: 5896216 (1999-04-01), Kikushima et al.
English-language Abstract of JP 4-54034, already of record, Feb. 1992.
S. Suzuki, et al., "Pulsed FM Single Subcarrier Optical Analog CATV Distribution System", The Institute of Electronics Informations and Communications Engineers, Autumn Conference, 1991, p. 4-63.
K. Kikushima, et al., "150-km Non-Repeated 60-Channel AM-Video Transmission Employing Optical Heterdyne AM/FM Converter", Proc. 21st Eur. Conf. on Opt. Comm. (ECOC '95--Brussels), pp. 1047-1050.

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