Significantly Increased Electronic Compensation of Semiconductor Optical Amplifiers
Significant increase in transmission distance Stronger, less distorted signals Greater flexibility of use
Long-haul networks Ultra-long-haul networks
The post-compensation method comprises receiving an optical signal distorted in the physical domain by an SOA and propagating the distorted optical signal backward in the electronic domain in a corresponding virtual SOA. The techniques of this post-compensation method involve the use of digital backward propagation in the electrical domain to convert a received optical signal into an estimated transmitted signal that then compensates for nonlinear impairments introduced by SOAs that reside along the transmission link(s).With a simulated DSP speed of 25 GHz, the impairment compensation of a 1200-kilometer link requires 22.3M of multiply-accumulate (MAC) units. The computational efficiency is 464 kMAC/bit with latency of 10.2 microseconds, considerably smaller than the transmission latency of 6 milliseconds in the fiber. Based on simulation results, for a 12 × 100 Gb/s 16-QAM/WDM (quadrature amplitude modulation/wavelength-division-multiplexing) system using nonzero dispersion-shifted fiber (NZ-DSF), the computational load is halved by the complementary filter pair design. The transmission distance is increased from 500 to 1200 kilometers by ENLC while preserving the same Q-value.
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