G - Physics – 02 – F
Patent
G - Physics
02
F
325/1, 349/48, 8
G02F 1/01 (2006.01) G02B 6/28 (2006.01) G02F 1/11 (2006.01) G02F 1/33 (2006.01)
Patent
CA 1249657
SINGLE MODE FIBER OPTIC SINGLE SIDEBAND MODULATOR Abstract of the Disclosure A fiber optic frequency shifter includes an optical fiber having two modes of propagation, each with a different propagation velocity, and a coupler for applying time varying stress to the fiber at first and second locations on the fiber, with a predetermined phase relationship between the stress at the two locations. The coupler may include a plurality of discrete coupling elements, such as ridges or driving electrodes and a driver to drive the coupling elements in accordance with driving signals having the predetermined phase difference, or the coupler may include an acoustic wave generator coupled to the fiber for applying to the fiber an actual travelling acoustic wave. With the discrete distributed coupling elements, the frequency of the driving signals and the phase relationship between the driving signals is such as to create a simulated travelling acoustic wave in the fiber. The real or apparent travelling acoustic wave in the fiber causes light propagating through the fiber to be coupled from one of the fiber modes to another of the fiber modes, and to cause the coupled light to be frequency shifted relative to the initial light. The wavelength of the real or apparent acoustic wave is approximately equal to an integer multiple of the fiber beat length to cause constructive coupling of the frequency shifted light.
468900
Brooks Janet L.
Shaw Herbert J.
Youngquist Robert C.
Board Of Trustees Of The Leland Stanford Junior University
Gowling Lafleur Henderson Llp
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