Polarization control on signal beams for principal-state bidirec

Details Polarization control on signal beams for principal-state bidirec Polarization control on signal beams for principal-state bidirec

1990-08-09

1991-07-16

Gonzalez, Frank

350 9630, G02B 616

Patent

active

050319981

ABSTRACT:
In a polarization control system for use in an optical communication system comprising an optical fiber (11), first and second polarization control devices (31, 41) are controlled to make the optical fiber bidirectionally transmit first and second signal beams with their respective incident polarization states rendered coincident with a common one or with respective ones of two principal states of the optical fiber. When the first signal beam is supplied to the first polarization control device with a first original polarization state and passes through the second polarization control device with a first variable polarization state and when the second signal beam is supplied to the second polarization control device with a second original polarization state and passes through the first polarization control device with a second variable polarization state, the first polarization control device keeps the second variable polarization state parallel or orthogonal to the first original polarization state. The second polarization control device keeps the first variable polarization state parallel or orthogonal to the second original polarization state. Each of the signal beams may be either a single signal beam or an FDM'ed signal beam.

REFERENCES:
patent: 4781424 (1988-11-01), Kawachi et al.
patent: 4793678 (1988-12-01), Matsumoto et al.
patent: 4960319 (1990-10-01), Dankowych
C. D. Poole et al., "Polarization Dispersion and Principal States in a 147-km Undersea Lightwave Cable", Journal of Lightwave Technology, vol. 6, No. 7, Jul. 1988, pp. 1185-1190.
R. Noe et al., "Endless Polarization Control Systems for Coherent Optics", Journal of Lightwave Technology, vol. 6, No. 7, Jul. 1988, pp. 1199-1208.

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