Device for optical heterodyne or homodyne detection of an optica

Details Device for optical heterodyne or homodyne detection of an optica Device for optical heterodyne or homodyne detection of an optica

1995-12-19

1995-12-19

Boudreau, Leo H.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359190, 359191, 359192, H04B 1006

Patent

active

054773695

ABSTRACT:
A device for optical heterodyne detection is described, using only two adjustable elements influencing the state of polarisation and having a limited control range (51, 52) in order to realize an endless polarisation control. In a first embodiment a temporary loss of signal intensity of at most 3 dB is accepted. This signal loss is avoided if a circuit of non-adjustable optical components (81, 82, 83) is incorporated in the heterodyne detection device.

REFERENCES:
patent: 4506388 (1985-03-01), Monerie
patent: 4697284 (1987-09-01), Glance
patent: 4752120 (1988-06-01), Shimizu
patent: 5124828 (1992-06-01), Mahon
Noe, "Endless Polarisation Control Het/Homodyne Receivers", Fiber Optics vol. 630, May 1986.
Noe, "Endless Polarization Control Experiment with Three Elements of Limited Birefrengent Range." Electronic Letters 124-86 vol. 22 #25.
Okoshi, "Polarization Control Scheme for Optical Heterodyne Receiver Using 2 Faraday Rotators " Electronic Letters, vol. 21 #18, Aug. 21, 1985 pp. 787-788.
Okoshi, "Polarization-State Control Schemes for Heterodyne or Homodyne Optical Fiber Communications", Journal of Lightwave Tech. vol. LT3#6, pp. 1232-1237.

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