Improvement of dispersion tolerance for electrical-binary-signal-based duobinary transmitters

Abstract

We present a way to improve the dispersion tolerance of an electrical-binary-signal-based duobinary transmitter, implemented by using a dual-arm Mach-Zehnder modulator driven with two complementary binary signals. Successful transmission over 200 km of single- mode fiber is achieved by optimizing the relative time delay between the binary signals and the driving voltage.

Simulation approach to the improvement of dispersion tolerance for electrical-binary-signal-based duobinary transmitters

“…The driving voltage of less than 25% induces an insertion loss of larger than 9 dB [15]. It can degrade the optical signal-to-noise ratio of the signals when an optical boost amplifier is employed at the output of the transmitter.…”

Improved dispersion tolerance of a Mach–Zehnder modulator by optimizing the modulator voltage and time delay

“…Many methods have been proposed to implement dispersion-tolerant optical duobinary transmitters, including using an MZM and electrical low-pass filters [5], an MZM and an electrical delay line [6], an MZM and an optical delay interferometer [7], and a phase modulator and an optical filter [8]. It is possible to obtain improved dispersion tolerance over that of conventional optical transmitters.…”

Simple and flexible generation of vestigial side band modified duobinary return-to-zero signals at 10, 20 and 40Gb/s

“…A range of duobinary data encoding have been studied extensively [1][2][3], because of their tolerance of transmission nonlinearity and dispersion. Various approaches for generating duobinary signals have been demonstrated.…”