In-line polarization-state converter

Details In-line polarization-state converter In-line polarization-state converter

2009-02-05

2010-11-30

Pak, Sung H (Department: 2874)

Optical waveguides

Optical transmission cable

Loose tube type

Reexamination Certificate

active

07844151

ABSTRACT:
The invention discloses an in-line polarization-state converter. In the polarization converter, a laser beam is radiated onto the side of a photosensitive optical fiber. The laser beam causes the refractive index of an optical fiber core to asymmetrically vary. Birefringence is induced in a core mode of the optical fiber by the variation in the asymmetrical refractive index. An optical fiber segment having the birefringence is generally disposed on a waveguide path of the optical fiber to change the polarization state of an optical signal passing through the optical fiber segment. That is, the phase of the optical signal passing through the optical fiber is changed by radiation of laser beams, which results in a variation in polarization state. The polarization converter disposed on the waveguide path is covered with a metal tube in order to prevent the polarization converter from being bent or broken. In addition, optical fiber connectors are provided at both ends of the polarization converter for easy connection.

REFERENCES:
patent: 4389090 (1983-06-01), LeFevre
patent: 4793678 (1988-12-01), Matsumoto et al.
patent: 5559907 (1996-09-01), Inniss et al.
patent: 2006/0067618 (2006-03-01), Hill

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