Control of a launched polarization state of a frequency modulate

Details Control of a launched polarization state of a frequency modulate Control of a launched polarization state of a frequency modulate

1994-03-30

1996-04-16

Hellner, Mark

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359122, 359156, 359192, G02F 0123

Patent

active

055088392

ABSTRACT:
In an optical communication system for transmitting an optical fiber which may include an optical amplifier comprising an optical isolator, a polarization control system comprises at a send end a launch polarization controller for giving a launched state to the signal beam launched to the optical fiber. Received at a receive end as a received beam of a received state of polarization, the signal beam is split by polarization into first and second beams, each including a reception component of the modulating frequency and of a variable optical intensity. A detection signal is produced from the first and the second beams to have the modulating frequency and a variable electric intensity. Controlled by a launch controller supplied with the detection signal, the launch polarization controller keeps the launched state to minimize at the receive end the electric intensity. Preferably, the received beam is split into four beams, which are given four differents direction of polarization and, from which the detection signal is produced.

REFERENCES:
patent: 4637072 (1987-01-01), Hellstrom
patent: 5013116 (1991-05-01), Yamazaki et al.
patent: 5031998 (1991-07-01), Ono et al.
patent: 5295013 (1994-03-01), Ono
T. Ono et al., "Novel Wideband Common Polarization Control Method for Coherent FDM Transmission System", Proceedings of ECOC '90, pp. 419-422.
H. Shimizu et al., "Highly Practical Fiber Squeezer Polarization Controller", Journal of Lightwave Technology, vol. 9, No. 10, Oct. 1991, pp. 1217-1224.
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.

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