Polarization switching light source, optical receiver, and coher

Details Polarization switching light source, optical receiver, and coher Polarization switching light source, optical receiver, and coher

1991-08-30

1993-09-21

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359189, 359192, 359183, H04B 1000, H04B 1006

Patent

active

052473821

ABSTRACT:
A polarization switching light source includes a semiconductor laser for outputting laser output light, a phase modulation circuit for subjecting phase modulation of a predetermined cyclic pattern to the semiconductor laser by supplying a pulse current thereto, a beam splitter for dividing output light from the semiconductor laser into first and second branch output light components having substantially the same power, an optical delay member for delaying the first branch output light with respect to the second branch output light by a predetermined amount, and a mixing member for mixing the first branch output light component, delayed by the optical delay member, with the second branch output light component while their polarization states are caused to be orthogonal. A delay time of the first branch output light component with respect to the second branch output light component is set to be a fraction of an integer of the period of the phase modulation.

REFERENCES:
patent: 4718120 (1988-01-01), Tzeng
patent: 5008958 (1991-04-01), Cimini, Jr. et al.
patent: 5031236 (1991-07-01), Hodgkinson et al.
patent: 5060311 (1991-10-01), Meissner et al.
Electronics Letters, vol. 24, No. 15, Jul. 21, 1988, pp. 974-976, I. M. I. Habbab, et al., "Phase-Insensitive Zero-If Coherent Optical System Using Phase Switching".

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