Method and apparatus for arbitrary spectral shaping of an optical pulse
First Claim
1. A method for stretching an optical pulse and shaping its spectrum, the method comprising the steps of:
- a. providing a an optical fiber element having a first long length fiber Bragg grating having a refractive index perturbation of varying periodicity;
b. launching the optical pulse into the fiber Bragg grating, wherein the Bragg grating reflects the pulse in a chromatically dispersed output;
c. coupling the reflected chromatically dispersed output from the grating into an optical modulator; and
d. temporally modifying the amplitude of the chromatically dispersed output to attenuate selected optical frequencies.
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Abstract
A method and an apparatus for stretching an optical pulse and shaping its spectrum. The method includes the step of: providing a an optical fiber element having a first long length fiber Bragg grating having a refractive index perturbation of varying periodicity. The optical pulse is launched into the fiber Bragg grating, wherein the Bragg grating reflects the pulse in a chromatically dispersed output. The reflected output is coupled with an optical modulator programmed to temporally modify the amplitude of the chromatically dispersed output to attenuate selected optical frequencies in a desired pattern. The apparatus for stretching and arbitrarily shaping the spectrum of an optical pulse with a desired wavelength resolution Δλres includes a routing optical device and an optical fiber element having a Bragg grating. The routing optical device routs energy between different waveguides, and has an input port to receive the optical pulse.
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Citations
20 Claims
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1. A method for stretching an optical pulse and shaping its spectrum, the method comprising the steps of:
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a. providing a an optical fiber element having a first long length fiber Bragg grating having a refractive index perturbation of varying periodicity;
b. launching the optical pulse into the fiber Bragg grating, wherein the Bragg grating reflects the pulse in a chromatically dispersed output;
c. coupling the reflected chromatically dispersed output from the grating into an optical modulator; and
d. temporally modifying the amplitude of the chromatically dispersed output to attenuate selected optical frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A pulse stretching and shaping apparatus for stretching and arbitrarily shaping the spectrum of an optical pulse with a desired wavelength resolution Δ
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res;a. a routing optical device that routs energy between different waveguides, the routing device having an input port, the input port receiving the optical pulse;
b. an optical fiber element having a long-length fiber Bragg grating optically coupled to the routing optical device, the Bragg grating having an increasing or decreasing periodicity, wherein - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification