Light receiving device

Details Light receiving device Light receiving device

1996-10-31

1999-06-15

Lefkowitz, Edward

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359160, 359179, 359195, H04B 1002

Patent

active

059127562

ABSTRACT:
To enable the filtering of a light signal without using an optical bandpass filter, the present invention provides the following construction: a light signal transmitted through an optical fiber enters an injection-locked laser device which is locked to the wavelength of the light signal to oscillate synchronously with the light signal; the locked light signal enters a light frequency discriminator to transform the frequency-modulated signal into an intensity modulated signal, and it enters a light receiver to be demodulated. Since the injection-locked laser device emits only a locked oscillation light signal, the received light signal can be extracted without using an optical bandpass filter.

REFERENCES:
patent: 5315674 (1994-05-01), Asako
patent: 5355248 (1994-10-01), Hedjifotiou
patent: 5485299 (1996-01-01), Jones
patent: 5542011 (1996-07-01), Robinson
patent: 5572356 (1996-11-01), Yoshida et al.
patent: 5793512 (1998-08-01), Ryu

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