Mutual wavelength locking in WDM-PONS
First Claim
1. An apparatus, comprising:
- a first transceiver to transmit a first set of optical signals in a first direction along a first wavelength channel; and
a second transceiver coupled to the first transceiver to transmit a second set of optical signals along the first wavelength channel in a second direction opposite to the first direction, wherein the first transceiver is wavelength locked using the second set of optical signals from the second transceiver and the second transceiver is wavelength locked using the first set of optical signals from the first transceiver, wherein the first transceiver saturates gain within a first response time to output the first set of optical signals, wherein the first response time is of the same order of magnitude or shorter than a first time period of data modulation onto the second set of optical signals to remove effects of the data modulation in the second direction that cause noise in the first direction, and the second transceiver saturates gain within a second response time to output the second set of optical signals, wherein the second response time is of the same order of magnitude or shorter than a second time period of the data modulation onto the first set of optical signals to remove effects of the data modulation in the first direction that cause noise in the second direction, wherein the first transceiver and the second transceiver are mutually saturated due to wavelength locking.
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Accused Products
Abstract
Methods and apparatuses to provide wavelength locked WDM Passive Optical Networks (“PONs”) are described. A first transceiver transmits a set of optical signals in a first direction along a wavelength channel. A second transceiver transmits another set of optical signals along the same wavelength channel in another direction. The wavelength of the first transceiver is locked using an optical power of the optical signals of the second transceiver. The wavelength of the second transceiver is locked using the optical power of the optical signals of the first transceiver. A WDM MUX/De-MUX is coupled between the first transceiver and the second transceiver. An in-line gain element can be coupled to the WDM MUX/De-MUX to amplify the optical signals. The first transceiver and the second transceiver operate in a saturated gain condition.
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Citations
37 Claims
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1. An apparatus, comprising:
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a first transceiver to transmit a first set of optical signals in a first direction along a first wavelength channel; and a second transceiver coupled to the first transceiver to transmit a second set of optical signals along the first wavelength channel in a second direction opposite to the first direction, wherein the first transceiver is wavelength locked using the second set of optical signals from the second transceiver and the second transceiver is wavelength locked using the first set of optical signals from the first transceiver, wherein the first transceiver saturates gain within a first response time to output the first set of optical signals, wherein the first response time is of the same order of magnitude or shorter than a first time period of data modulation onto the second set of optical signals to remove effects of the data modulation in the second direction that cause noise in the first direction, and the second transceiver saturates gain within a second response time to output the second set of optical signals, wherein the second response time is of the same order of magnitude or shorter than a second time period of the data modulation onto the first set of optical signals to remove effects of the data modulation in the first direction that cause noise in the second direction, wherein the first transceiver and the second transceiver are mutually saturated due to wavelength locking. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system, comprising:
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a first wavelength division multiplexing multiplexer/de-multiplexer (“
WDM MUX/De-MUX”
) having a first wavelength channel;a first transceiver to send a first set of optical signals in a first direction along the first wavelength channel; a gain element coupled to the WDM MUX/De-MUX; and a second transceiver coupled to the gain element to send a second set of optical signals in a second direction along the first wavelength channel, wherein the second direction is opposite to the first direction, wherein the first transceiver is wavelength locked using the second set of optical signals, and the second transceiver is wavelength locked using the first set of optical signals, and wherein the first transceiver saturates gain within a first response time to output the first set of optical signals, wherein the first response time is of the same order of magnitude or shorter than a first time period of data modulation onto the second set of optical signals to remove effects of the data modulation in the second direction that cause noise in the first direction and the second transceiver saturates gain within a second response to output the second set of optical signals time, wherein the second response time is of the same order of magnitude or shorter than a second time period of the data modulation onto the first set of optical signals to remove effects of the data modulation in the first direction that cause noise in the second direction, wherein the first transceiver and the second transceiver are mutually saturated due to wavelength locking. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method, comprising:
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transmitting a first set of optical signals along a first wavelength channel in a first direction from a first transceiver; transmitting a second set of optical signals along the first wavelength channel in a second direction from a second transceiver, wherein the second direction is opposite to the first direction; locking a first wavelength of the first transceiver using the second set of the optical signals; and locking a second wavelength of the second transceiver using the first set of the optical signals, wherein the first transceiver saturates gain within a first response time to output the first set of optical signals, wherein the first response time is of the same order of magnitude or shorter than a first time period of data modulation onto the second set of optical signals to remove effects of the data modulation in the second direction that cause noise in the first direction, and the second transceiver saturates gain within a second response time to output the second set of optical signals, wherein the second response time is of the same order of magnitude or shorter than a second time period of the data modulation onto the first set of optical signals to remove effects of the data modulation in the first direction that cause noise in the second direction, wherein the first transceiver and the second transceiver saturate each other due to mutual wavelength locking. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. An apparatus, comprising:
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means for transmitting a first set of optical signals along a first wavelength channel in a first direction from a first transceiver; means for transmitting a second set of optical signals along the first wavelength channel in a second direction from a second transceiver, wherein the second direction is opposite to the first direction; means for locking a first wavelength of the first transceiver using the second set of the optical signals; and means for locking a second wavelength of the second transceiver using the first set of the optical signals, wherein the first transceiver saturates gain within a first response time to output the first set of optical signals, wherein the first response time is of the same order of magnitude or shorter than a first time period of data modulation onto the second set of optical signals to remove effects of the data modulation in the second direction that cause noise in the first direction, and the second transceiver saturates gain within a second response time to output the second set of optical signals, wherein the second response time is of the same order of magnitude or shorter than a second time period of the data modulation onto the first set of optical signals to remove effects of the data modulation in the first direction that cause noise in the second direction, wherein the first transceiver and the second transceiver are mutually saturated due to wavelength locking. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification