Abstract
Hybrid systems combining distributed Raman amplification and phase-sensitive amplifiers (PSAs) are investigated in numerical simulations. We focus on the mitigation of fiber nonlinearities and the impact of the span power map which is also important in systems employing optical phase conjugation or phase-conjugated twin waves. We simulate multi-span PSA links with and without distributed Raman amplification and show that by including distributed Raman amplification, the transmission distance increases more at optimum launch power than in the linear regime. For a 5-channel WDM QPSK PSA-amplified system, we observe a transmission reach increase by a factor of 8.1 by including ideal distributed Raman amplification.
Highlights
Coherent fiber-optic communication systems encode information on both the amplitude and phase of the optical field
We have numerically studied the impact of the span power map on single- and multi-span phase-sensitive amplifiers (PSAs) systems operating in the nonlinear regime
We focus on PSA systems without Raman amplification, i.e. an exponentially decaying span power map
Summary
Coherent fiber-optic communication systems encode information on both the amplitude and phase of the optical field. The waves can, e.g., be transmitted on orthogonal polarizations or in different time slots [11] instead of at different wavelengths Another scheme with similarities to PSA-amplified links is optical phase conjugation (OPC). The impact of distributed Raman amplification on the performance, in a nonlinear regime, of fiber-optic communication systems that perform coherent superposition using PSAs. First, a single-span system is studied to determine in which cases it is beneficial to make use of Raman amplification in such systems. We investigate a multi-span system that performs the coherent superposition span-wise using PSAs. The role of the span power map in these systems is discussed and we show that there are significant performance gains possible for a multi-span system in the nonlinear regime by increasing the degree of symmetry of the span power map with the use of distributed Raman amplification.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
