Nonlinear device comprising a spectrally broadening fiber
First Claim
1. An optical communication system, comprising:
- an optical regenerator, including a nonlinear optical fiber that has a non-linear response to at least some input optical pulses, resulting in the spectral broadening of at least some such pulses, and including an output filter coupled to the nonlinear optical fiber;
a wavelength-selective detector configured to make measurements indicative of spectral broadening in the input optical pulses that have passed through the nonlinear optical fiber,wherein, for at least some pulses whose enemy is distributed into a central wavelength band and plural wavelength sidebands, at least a portion of the detector is configured to detect optical power in a respective sideband or group of sidebands exclusive of the central band; and
a device or circuit, in receiving relationship to the detector, configured to provide a diagnostic signal or feedback signal, in response to the detected sideband optical power, in the course of operation of the system.
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Accused Products
Abstract
Embodiments of the invention include system for monitoring the effectiveness of pulse shaping in a nonlinear optical fiber (40). The spectral content of the pulse, after passing through the nonlinear fiber (40), provides an indication of how effectively the pulse was regenerated. A portion of the pulse exiting the nonlinear fiber is tapped off and its pulse energy is measured in at least one selected spectral region. The selected spectral region is one in which the pulse tends to gain energy when effective regeneration is taking place. The information concerning the effectiveness of pulse shaping in a nonlinear optical fiber is fed back to dynamically change the residual dispersion at the regenerator input. The spectral measurement leads to a control signal (48) to indicate a level of performance of the system, or to improve the performance of the system by adjusting an operational parameter.
18 Citations
6 Claims
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1. An optical communication system, comprising:
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an optical regenerator, including a nonlinear optical fiber that has a non-linear response to at least some input optical pulses, resulting in the spectral broadening of at least some such pulses, and including an output filter coupled to the nonlinear optical fiber; a wavelength-selective detector configured to make measurements indicative of spectral broadening in the input optical pulses that have passed through the nonlinear optical fiber, wherein, for at least some pulses whose enemy is distributed into a central wavelength band and plural wavelength sidebands, at least a portion of the detector is configured to detect optical power in a respective sideband or group of sidebands exclusive of the central band; and a device or circuit, in receiving relationship to the detector, configured to provide a diagnostic signal or feedback signal, in response to the detected sideband optical power, in the course of operation of the system. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification