Simulation of high speed and long-haul optical communication systems

Abstract EN

In high speed optical transmission system, three primary effects limit its speed and transmission distance.

These effects are the fiber dispersion, fiber nonlinearities and amplified spontaneous emission (ASE) noise, the last one is introduce in optical amplification process along fiber length.

Management of these fiber effects is the key for high bit rate and long haul transmission distance.

In this work, methodologies of creating optical communication system is presented, an optical communication link is constructed and simulated, this includes ; optical transmitter, the transmitter characteristics of fiber and optical receiver.

The interplay effects among various fibers transmissions characteristic is studied and analyze.

Results show that and in term of optical amplifier spacing, and for 40Gbps system speed, the system performance degrade obviously at 20km amplifier spacing, this results from that the interaction between amplifier noise and fiber nonlinearity along 20km is enough to degrade system performance.

Any increasing of amplifier spacing above 90km, the system performance degrades gradually and the dominant limiting factor is the ASE noise.

Using post-compensation dispersion map, non-return to zero (NRZ) signal format and setting optical system parameters to optimal values, makes the optical system capable of transmitting 40Gbps over 1060km of standard single mode fiber length, with 1.2 10-12 bit error rate.