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US 7,528,385 B2Granted
Fiber optic devices having volume Bragg grating elements
AssigneePD-LD, Inc.
InventorsBoris L. Volodin, Vladimir Sinisa Ban
Life of this patent
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AssigneePD-LD, Inc.
InventorsBoris L. Volodin, Vladimir Sinisa Ban
Estimating the term…
Apparatus and methods for controlling the spectral shape of a Bragg grating element (“VBG”) filter are disclosed. An optical system can be adapted to deliver a recording beam to the front focal plane of a lens. The recording beam may cause to be formed, in the front focal plane of the lens, an optical distribution that represents the desired filter response of the VBG element. A recording medium sample may be placed in the back focal plane of the same lens. The lens creates a true Fourier transform of the distribution in the optical plane directly on the recording medium. Via coherent interference with the plane reference wave, both the amplitude and the phase of the Fourier transform are transferred to the amplitude and phase envelope of the VBG imprinted on the recording material. A mask representing the desired filter shape may be placed in the front focal plane of the lens. The recording beam may be shone through the mask, such that a masked recording beam exits the mask in the front focal plane of the lens. The masked recording beam may represent the desired filter response of the VBG element.
Apparatus for producing an optical element having a desired spectral filter response, the apparatus comprising:
A method for producing an optical element having a desired spectral filter response, the method comprising:
A three-dimensional optical element having a desired spectral filter response, the optical element made according to a method comprising:
Dependencies are inferred from the claim text.