Interferometric method and apparatus for the characterization of optical pulses
First Claim
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1. A method, comprising:
- splitting an optical pulse into two replicas separated by a delay;
modulating said two replicas with a periodic phase modulation having a period substantially equal to twice the delay between the replicas such that each of the replicas experiences a linear temporal phase modulation;
measuring a spectrum of said modulated replicas; and
characterizing said optical pulse using said measured spectra.
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Abstract
A method and apparatus for the characterization of an optical pulse includes splitting an optical pulse into two replicas separated by a delay, modulating at least one of the two replicas with a linear temporal phase modulation, measuring a spectrum of the modulated replicas, and characterizing the optical pulse using the measured spectra. In one embodiment of the present invention a spectral phase difference between the replicas is obtained from the measured spectrum using Fourier Transform Spectral Interferometry.
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Citations
34 Claims
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1. A method, comprising:
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splitting an optical pulse into two replicas separated by a delay;
modulating said two replicas with a periodic phase modulation having a period substantially equal to twice the delay between the replicas such that each of the replicas experiences a linear temporal phase modulation;
measuring a spectrum of said modulated replicas; and
characterizing said optical pulse using said measured spectra. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for calibrating the linear spectral phase difference attributable to a temporal delay between two replicas of an optical pulse, comprising:
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modulating said two replicas with a periodic phase modulation such that each of the replicas experiences a linear temporal phase modulation, and such that a first of said two replicas is modulated by a linear temporal phase modulation of first slope and the second of said two replicas is modulated by a linear temporal phase modulation of second slope;
measuring a first spectrum of said modulated replicas;
determining a first spectral phase difference between said modulated replicas from said first spectrum;
modulating said two replicas such that the first replica is modulated by a linear temporal phase modulation of the second slope and the second replica is modulated by a linear temporal phase modulation of the first slope, measuring a second spectrum of said modulated replicas;
determining a second spectral phase difference between said modulated replicas from said second spectrum; and
determining and eliminating a linear spectral phase difference between said two replicas attributable to the delay by comparing said two determined spectral phase differences. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for characterizing an optical pulse, comprising:
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a waveguide interferometer for splitting said optical pulse into two replicas separated by a delay;
at least one waveguide temporal phase modulator for modulating at least one of said replicas; and
a frequency-resolving device for measuring a spectrum of said modulated replicas;
wherein said at least one replica is modulated with a linear temporal phase modulation. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification