Fading mitigation of turbulent channel based on polarization diversity in coherent optical receivers
First Claim
1. A method comprising:
- applying, at a first communication terminal, a time delay between a first polarization portion of an optical signal and a second polarization portion of the optical signal to delay the second polarization in time relative to the first polarization;
combining, at the first communication terminal, the first polarization portion carrying a first data packet and the second polarization portion carrying a replica of the first data packet in the optical signal, the first polarization portion having a different polarization than the second polarization portion; and
,transmitting, using transmitter optics at the first communication terminal, the optical signal to a second communication terminal using the time delay between transmitting the first data packet and transmitting the replica of the first data packet,wherein applying the time delay includes determining the time delay between the second polarization portion and the first polarization portion based on environmental conditions at the first communication terminal.
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Accused Products
Abstract
A method includes receiving a first data packet on a first polarization portion of an optical signal from a second communication terminal through a free space optical link during a first time period and receiving a first data packet replica on the first polarization portion of the optical signal during a second time period. The second time period is delayed in time relative to the first time period. The method also includes determining receiving powers for the optical link during both the first time period and the second time period based on at least one of the received first data packet and the received first data packet replica. The method also includes selecting the one of the first data packet or the first data packet replica that is associated with the highest receiving power for the optical link as surviving data for maintaining the optical link.
30 Citations
18 Claims
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1. A method comprising:
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applying, at a first communication terminal, a time delay between a first polarization portion of an optical signal and a second polarization portion of the optical signal to delay the second polarization in time relative to the first polarization; combining, at the first communication terminal, the first polarization portion carrying a first data packet and the second polarization portion carrying a replica of the first data packet in the optical signal, the first polarization portion having a different polarization than the second polarization portion; and
,transmitting, using transmitter optics at the first communication terminal, the optical signal to a second communication terminal using the time delay between transmitting the first data packet and transmitting the replica of the first data packet, wherein applying the time delay includes determining the time delay between the second polarization portion and the first polarization portion based on environmental conditions at the first communication terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A first communication terminal comprising:
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transmitter optics; control hardware in communication with the transmitter optics; and memory hardware in communication with the control hardware, the memory hardware storing instructions that when executed on the control hardware cause the control hardware to perform operations comprising; applying a time delay between a first polarization portion and a second polarization portion to delay the second polarization in time relative to the first polarization; combining the first polarization portion carrying a first data packet and the second polarization portion carrying a replica of the first data packet in an optical signal, the first polarization portion having a different polarization than the second polarization portion; and transmitting, using transmitter optics, the optical signal to a second communication terminal using the time delay between transmitting the first data packet and transmitting the replica of the first data packet, wherein applying the time delay includes dynamically adjusting the time delay between the second polarization portion and the first polarization portion based on environmental conditions at the first communication terminal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory, tangible computer-readable storage medium on which computer readable instructions of a program are stored, the instructions, when executed by one or more processors, cause the one or more processors to perform a method, the method comprising:
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applying, at a first communication terminal, a time delay between a first polarization portion and a second polarization portion to delay the second polarization in time relative to the first polarization; combining, at the first communication terminal, the first polarization portion carrying a first data packet and the second polarization portion carrying a replica of the first data packet in an optical signal, the first polarization portion having a different polarization than the second polarization portion; and transmitting, using transmitter optics at the first communication terminal, the optical signal to a second communication terminal using the time delay between transmitting the first data packet and transmitting the replica of the first data packet, wherein applying the time delay includes determining the time delay between the second polarization portion and the first polarization portion based on environmental conditions at the first communication terminal. - View Dependent Claims (18)
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Specification