Optical waveguides – Polarization without modulation
Patent
1992-10-28
1994-05-10
Ullah, Akm E.
Optical waveguides
Polarization without modulation
372 6, G02F 101, G02B 616
Patent
active
053116038
ABSTRACT:
A superfluorescent broadband fiber laser source comprises an optical fiber doped with a laser material and having one end pumped with pump light of sufficient intensity to produce amplified spontaneous emission within the fiber and forward and backward waves therefrom. The polarizations of the backward wave experiences a 45.degree. rotation as it travels into and another 45.degree. rotation as it passes back out of a 45.degree. Faraday rotator mirror device. An amplified polarization=rotated beam from the doped fiber is divided into orthogonally polarized beams in a polarization beam splitter coupler. A return polarized signal from an interferometer is passed through the doped fiber, the Faraday rotator mirror device and the doped fiber for producing a polarized output signal that has been amplified by four passes through the doped fiber.
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Theory of Superfluorescent Fiber Laser by M. Digonnet, Jr. Lightwave Technology, vol. 4, N11, Nov., 1986, pp. 1631-1639.
Litton Systems Inc.
Ullah Akm E.
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