Abstract
The optical phase conjugation (OPC) process is thoughtfully investigated in a nonlinear bidirectional semiconductor optical amplifier subsystem (SOA), demonstrating the conjugation conversion through the two ports of the SOA, simultaneously. The spectral responses, the nonlinear power curves and the quality optimization of the conjugated are discussed through the simulation in nonlinear bidirectional configuration. The experimental investigation of the polarization-insensitive SOA further confirms the OPC behavior in the bidirectional operation, achieving the error-free conjugation conversion with an output optical signal-to-noise ratio (OSNR) of up to 16 dB. The nonlinear bidirectional SOA configuration tested in the system relaxes the requirement of the conventional four-wave mixing (FWM), enabling the OPC conversion with the signal regeneration in only one unit.
Highlights
With the exponential growth on the transmission rate of the optical fiber communication networks, the technologies significantly increasing the system capacity, e.g., advanced modulation formats or ultra-high-density multiplexing, have been implemented into the real transmission system [1]
To improve the system performance, great efforts through proposing novel approaches have been carried out for decades. These methods can be categorized into two groups: one is to deal with the distortions in the electrical domain at the receiver end; and the other is implemented into the middle of the transmission link directly in the optical domain
The optical phase conjugation (OPC) is more suitable to be implemented into the transmission link when dealing with the deterministic distortions that originated from the fiber dispersion or the Kerr nonlinearity, without implementing the amplitude or phase matching processes that have to be carefully performed in the regenerators, especially for the multi-level modulation formats [11]
Summary
With the exponential growth on the transmission rate of the optical fiber communication networks, the technologies significantly increasing the system capacity, e.g., advanced modulation formats or ultra-high-density multiplexing, have been implemented into the real transmission system [1] Such a system becomes more vulnerable due to the higher requirement on the optical signal-to-noise ratio (OSNR), whose performance is sensitive to the accumulated amplifier spontaneous emission (ASE) noise, the fiber dispersion, or the Kerr effect-induced nonlinear distortions [2–4]. The OPC is more suitable to be implemented into the transmission link when dealing with the deterministic distortions that originated from the fiber dispersion or the Kerr nonlinearity, without implementing the amplitude or phase matching processes that have to be carefully performed in the regenerators, especially for the multi-level modulation formats [11].
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