Gain Flattening Approach to Physical EDFA for 16 × 40 Gb/s NRZ-DPSK WDM Optical Communication Systems

Abstract

We are using different approaches to gain flattening in EDFAs without using additional components; i.e., gain flattening filter, dispersion shift fiber, periodic gratings, etc. By using gain flatten approach 3, it is possible to achieve the transmission of sixteen channels at 40 Gb/s wavelength division multiplexing (WDM) over a transmission distance of 490 km by single-mode fiber and dispersion-compensating fiber at a span of 70 km with channel spacing of 200 GHz. We observed the bit error rate less than 10^-9 and power of received signal more than -5 dBm with NRZ-DPSK format.

Keywords:

• EDFA
• DPSK
• WDM
• gain flattening

Acknowledgment

The authors thank the Rsoft design group for the OptSim simulation software for optical communications systems. The authors are also thankful to the referees of this paper for their suggestions and comments.