An all-optical CSNRZ, DBNRZ& MDBNRZ to NRZ Format Conversion Strategy Based on a Single Mach-Zehnder Delayed Interferometer (MZ-DI)

We proposed and demonstrated an all-optical format conversion strategy which has the capability to convert following modulation formats: carrier suppressed non-return to-zero (CSNRZ) to non-return to zero (NRZ), Duobinary non-return to zero (DBNRZ) to NRZ, Modified Duobinary non-return to zero MDBNRZ to NRZ, by exploiting cross-phase modulation (XPM) in a mach-Zehnder delayed interferometer (MZ-DI). It has been shown that proposed scheme exhibits fine performance upto 20 Gbps line rates. Further, in order to formulate optimum delay in MZ-DI structure, investigations have been carried out by varying delay of MZI-DI from 1 to 20 ps, and variations in Quality factor and Eye-opening factor (%) have been noticed at transmission port (T-port) of MZI-DI. Further, a comparison has been made in order to identify the most suitable input modulation format for the proposed format converter among CSNRZ, DBNRZ & MDBNRZ that yields best performance in terms of Q-factor, ER and EO (%) at the T-Port.It has been from observed from performance analysisthat CSNRZ is more suitable input format as compared to DBNRZ, MDBNRZ while converting to NRZ format all-optically utilizing the proposed MZ-DI scheme.