Optical heterodyne detector and receiver

Details Optical heterodyne detector and receiver Optical heterodyne detector and receiver

1993-04-27

1995-05-09

Moore, David K.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359192, H04B 1006

Patent

active

054145503

ABSTRACT:
An optical heterodyne detector and receiver rejects an image signal stably regardless of disturbance. Signal light is passed through a first polarization controller and a polarization separator for conversion into linearly polarized light. The signal light and locally oscillated light that has passed through a second polarization controller are coupled with each other by an optical coupler. Light emitted from a first output port of the optical coupler is received to produce a first beat signal. Light emitted from a second output port of the optical coupler is applied to a polarization maintaining fiber whose own axis is inclined 45.degree. to the polarization of the signal light. Light emitted from the polarization maintaining fiber is received to produce a second beat signal. The first polarization controller is operated to control the polarization of the signal light for maximizing the first beat signal at all times. The second polarization controller is operated to control the polarization of the locally oscillated light for maximizing the second beat signal at all times.

REFERENCES:
patent: 4856093 (1989-08-01), Mohr
patent: 4903342 (1990-02-01), Yamazaki
patent: 5052051 (1991-09-01), Naito et al.
B. F. Jorgensen et al., "Analysis of Optical Amplifier . . . Systems with Optical Image Rejection Receivers", Journal of Lightwave Technology, vol. 10, No. 5, May 1992, pp. 660-671.
H. Shimizu et al., "Highly Practical Fiber Squeezer Polarization Controller", Journal of Lightwave Technology, vol. 9, No. 10, Oct. 1991, pp. 1217-1224.
B. J. Jorgensen et al., "Simple Method to Improve Dynamic Range of Optical Amplifiers in . . . Heterodyne Receivers", Electronics Letters, vol. 27, No. 7, Mar. 28, 1991, pp. 611-612.

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