Compensation of transmission impairments in polarization multiplexed systems
View Patent ↗Systems and methods of compensating for transmission impairment are disclosed. One such method includes receiving a polarization-division multiplexed optical signal which has been distorted in the physical domain by an optical transmission channel, and propagating the distorted polarization-division multiplexed optical signal backward in the electronic domain in a corresponding virtual optical transmission channel.
1. A method of compensating for transmission impairment, the method comprising:
receiving a polarization-division multiplexed optical signal which has been distorted in the physical domain by an optical transmission channel that includes an optical fiber and an optical amplifier;
converting the distorted polarization-division multiplexed optical signal into an electronic domain; and
processing the distorted polarization-division multiplexed optical signal, in the electronic domain, by modeling a virtual optical fiber, corresponding to the optical fiber, in a virtual optical transmission channel, corresponding to the optical transmission channel, according to a Manakov equation, the modeling using dispersion, loss and nonlinearity parameters, opposite in value to corresponding parameters of the optical fiber, to account for dispersion, intra-channel, and at least some inter-channel impairments.
2. The method of claim 1 , wherein the virtual optical transmission channel includes a virtual attenuator, the method further comprising:
modeling the virtual attenuator with an attenuation parameter that balances a gain of the corresponding optical amplifier.
3. The method of claim 1 , wherein the Manakov equation is a full Manakov equation.
4. The method of claim 1 , wherein the Manakov equation is a set of coupled Manakov equations.
5. The method of claim 1 , further comprising:
solving the Manakov equation using a split-step Fourier method.
6. The method of claim 1 , further comprising:
solving the Manakov equation using a split-step infinite impulse response method.
7. A receiver comprising:
memory containing instructions stored thereon;
a processor configured by the instructions;
an optical detector configured to receive a polarization-multiplexed optical signal which has been distorted in the physical domain by an optical transmission channel and further configured to provide a corresponding distorted polarization-multiplexed electrical signal to the processor,
wherein the processor is configured by the instructions to:
process the distorted polarization-multiplexed electrical signal, in the electronic domain, by modeling a virtual optical fiber, corresponding to the optical fiber, in a virtual optical transmission channel, corresponding to the optical transmission channel, according to a Manakov equation, the modeling using dispersion, loss and nonlinearity parameters, opposite in value to corresponding parameters of the optical fiber, to account for dispersion, intra-channel, and at least some inter-channel impairments.
8. The receiver of claim 7 , wherein the Manakov equation is a full Manakov equation.
9. The receiver of claim 7 , wherein the Manakov equation is a set of coupled Manakov equations.
10. The receiver of claim 7 , wherein the processor is further configured to:
model the virtual attenuator with an attenuation parameter that balances a gain of the corresponding optical amplifier.
11. The receiver of claim 7 , wherein the processor is further configured to:
solve the Manakov equation using a split-step method.
12. The receiver of claim 7 , wherein the processor is further configured to:
solve the Manakov equation using a split-step infinite impulse response method.