Patent
1984-11-16
1986-07-01
Punter, William H.
350403, 350407, G02B 2728
Patent
active
045976406
ABSTRACT:
An active system for restoring the polarization state of light emerging from a single-mode optical fiber. The system changes the slowly varying elliptical polarization resulting from environmental effects on the long fiber to a linear polarization state of fixed orientation. The elliptically polarized light is converted into two orthogonal linearly polarized beams. One of the beams is used in a feedback circuit to null its intensity thereby restoring all the input light to the other linear polarization state.
REFERENCES:
patent: 3177761 (1965-04-01), Redner
Hardy, W. A. "Coupled Mode Switching Device", IBM Tech. Disc. Bull., 11-1964, pp. 480-481.
Jackson et al, "Elimination of Drift in a Single-Mode Optical Fiber Interferometer Using Piezoelectrically Stretched Coiled Fiber", App. Optics, 9-1980, pp. 2926-2929.
Mohr et al, "Active Polarization Stabilization System for Use with Coherent Transmission Systems or Fibre-Optic Sensors", Proc. 9th Europ. Conf. on Opt. Comm., Geneva, Switz., 10-1983, pp. 313-316.
EP98730, 1-1984, European Patent App., Shirasaki.
Kubota et al, "Electro-Optical Polarization Control on Single-Mode Optical Fibres", Electronics Letts., 7-1980, p. 573.
Martinelli, M., "Unlimited Phase Compensator for Fiber-Optic Interferometric Detection of Slow Temperature Change", Optics Letts., 9-1984, pp. 429-431.
Fisher Fred
GTE Laboratories Incorporated
Punter William H.
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