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US 8,412,054 B2Granted
DQPSK/DPSK optical receiver with tunable optical filters
AssigneeVerizon Patent and Licensing Inc.
InventorsDavid Zhi Chen, E. Evert Basch
Life of this patent
Estimating the term…
Abstract
An optical receiver includes a first interferometer having a plurality of arms. The optical receiver further includes first tunable optical filters connected in series with the arms of the first interferometer, where each first tunable optical filter is tuned to filter a region of overlap in the optical frequency spectrum between adjacent optical channels.
Claims20
A method comprising:
- tuning an optical filter in an arm of an interferometer,
- tuning the optical filter including:
- tuning the optical filter to a first plurality of filter positions,
- one of the first plurality of filter positions being left of a center frequency and another one of the first plurality of filter positions being right of the center frequency, and
- another optical filter in another arm of the interferometer being positioned at the center frequency during the tuning of the optical filter;
- measuring at least one of bit error rates (BERs) or Q-values associated with the interferometer during the tuning of the optical filter;
- and
- maximizing, based on the measuring, at least one of BER performance or Q-value performance of the interferometer.
5 more elements
A method comprising:
- tuning an optical filter in an arm of an interferometer,
- tuning the optical filter including:
- simultaneously tuning the optical filter and another optical filter,
- the other optical filter being positioned in another arm of the interferometer,
- the optical filter being tuned from a first offset from a center frequency towards the center frequency,
- the other optical filter being tuned from a second offset from the center frequency towards the center frequency, and
- the first offset being less than the center frequency and the second offset being greater than the center frequency;
- measuring at least one of bit error rates (BERs) or Q-values associated with the interferometer during the tuning of the optical filter;
- and
- adjusting, based on the measuring, at least one of BER performance or Q-value performance of the interferometer.
7 more elements
A system comprising:
- one or more devices to:
- tune an optical filter in an arm of an interferometer to a plurality of first positions,
- the optical filter being tuned to reduce channel overlap between adjacent optical channels,
- one of the first plurality of filter positions being left of a center frequency,
- another one of the first plurality of filter positions being right of the center frequency, and
- another optical filter in another arm of the interferometer being positioned at the center frequency during the tuning of the optical filter,
- measure at least one of bit error rates (BERs) or Q-values associated with the interferometer during the tuning of the optical filter, and
- adjust, based on the measuring, at least one of BER performance or Q-value performance of the interferometer.
5 more elements
A system comprising:
- a device to:
- simultaneously tune an optical filter in an arm of an interferometer and another optical filter in another arm of the interferometer, to filter a region of overlap between adjacent optical channels,
- the optical filter being tuned from a first offset from a center frequency towards the center frequency,
- the other optical filter being tuned from a second offset from the center frequency towards the center frequency, and
- the first offset being less than the second frequency and the second offset being greater than the center frequency,
- measure at least one of bit error rates (BERs) or Q-values associated with the interferometer during the tuning of the optical filter, and
- maximize, based on the measuring, at least one of BER performance or Q-value performance of the interferometer.
4 more elements
Dependencies are inferred from the claim text.