Monitoring mechanisms for optical systems
First Claim
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1. A device, comprising:
- a fiber loop;
an optical coupler in said fiber loop to couple input light into said fiber loop as two counter-propagating waves in said loop and to couple light in said loop out as an output beam;
a polarization device in said fiber loop to change polarization of light in said loop to achieve a maximum power level and a minimum power level in said output beam;
an optical detector to receive said output beam to produce a detector signal; and
a circuit to process said detector signal to produce an output indicative of a signal-to-noise ratio or a degree of polarization in said input light from said maximum and minimum power levels.
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Abstract
This application describes optical monitoring devices and applications in optical systems for monitoring various optical parameters of light, including the signal to noise ratio, the degree of polarization, and the differential group delay (DGD).
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Citations
11 Claims
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1. A device, comprising:
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a fiber loop; an optical coupler in said fiber loop to couple input light into said fiber loop as two counter-propagating waves in said loop and to couple light in said loop out as an output beam; a polarization device in said fiber loop to change polarization of light in said loop to achieve a maximum power level and a minimum power level in said output beam; an optical detector to receive said output beam to produce a detector signal; and a circuit to process said detector signal to produce an output indicative of a signal-to-noise ratio or a degree of polarization in said input light from said maximum and minimum power levels. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device, comprising:
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a polarization device to adjust polarization of received light to produce output light to find a maximum power level and a minimum power level of each WDM (wavelength division multiplexed) channel of different WDM channels in said received light; a WDM demultiplexer to receive said output light and to separate different WDM channels in said output light; a plurality of polarizers in optical paths of said different WDM channels, respectively; a plurality of optical detectors to respectively receive said different WDM channels after transmission through said polarizers; and a circuit to process output signals from said optical detectors to produce an output for each WDM channel indicative of a signal-to-noise ratio or a degree of polarization in said each WDM channel from said maximum power level and said minimum power level. - View Dependent Claims (8, 9, 10, 11)
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Specification