Optical apparatus for pulling an intermediate frequency in a pre

Details Optical apparatus for pulling an intermediate frequency in a pre Optical apparatus for pulling an intermediate frequency in a pre

1988-07-21

1990-03-27

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455610, H04B 1006

Patent

active

049125273

ABSTRACT:
In an optical apparatus for pulling an intermediate frequency in a predetermined frequency range, a local oscillation light source is swept in an oscillation frequency thereof in accordance with a signal applied to a frequency adjusting terminal thereof. The signal is of a counted value of a counter which counts pulse signals of an oscillator. When an intermediate frequency is pulled in a predetermined frequency range including a predetermined intermediate frequency, the counter is stopped to count the pulse signals, and is controlled to hold a then counted value which will be a fixed driving signal for the local oscillation light source.

REFERENCES:
patent: 4625331 (1986-11-01), Richardson et al.
patent: 4704741 (1987-11-01), Shikada
patent: 4727591 (1988-02-01), Manlove
S. Lowney and D. Marquis, "Frequency Acquisition and Tracking for Optical Heterodyne Communication Systems", Jour. Lightwave Tech., vol. LT--5, No. 4, 4/87, pp. 538-550.
"New Polarisation--State Control Device: Rotatable Fibre Cranks", ELECTRONICS LETTERS, Sep. 26, 1985, vol. 21, No. 20, pp. 895-896; Okoshi et al.
Y. Yamamoto et al., "Coherent Optical Fiber Transmission Systems", IEEE JOURNAL OF QUANTUM ELECTRONICS, vol QE--17, No. 6, Jun. 1981, pp. 919-935.

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