Gils for heterodyne receiver having low intermediate frequency

Details Gils for heterodyne receiver having low intermediate frequency Gils for heterodyne receiver having low intermediate frequency

1997-02-12

1998-05-26

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1006

Patent

active

057575312

ABSTRACT:
An optical heterodyne receiver converts a received modulated optical signal into an electrical IF signal by an IF converter which includes a local laser, a coupling element and an opto-electrical converter. The IF signal is converted into a demodulated signal by a demodulator having a quadratic transfer characteristic. To permit a relatively low intermediate frequency, the IF converter converts the received signal into two quadrature IF signals and in the demodulator two sub-demodulators recover therefrom two demodulated signals which are then combined. This eliminates unwanted quadratic components in the combined signal.

REFERENCES:
patent: 5081712 (1992-01-01), Meissner
patent: 5115332 (1992-05-01), Naito
patent: 5134634 (1992-07-01), Yoshida
patent: 5138476 (1992-08-01), Shibutani
patent: 5140277 (1992-08-01), Hooijmans et al.
patent: 5146359 (1992-09-01), Okoshi et al.
patent: 5259033 (1993-11-01), Goodings et al.

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