Open AccessBER-adaptive flexible-format transmitter for elastic optical networks
Author(s) -
Hyeon Yeong Choi,
Takehiro Tsuritani,
Ramon Casellas
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.018652
Subject(s) - quadrature amplitude modulation , phase shift keying , amplitude and phase shift keying , transmitter , computer science , pulse amplitude modulation , modulation (music) , keying , electro optic modulator , analog transmission , amplitude modulation , optical modulation amplitude , chirp , phase modulation , physics , signal (programming language) , qam , electronic engineering , optics , bandwidth (computing) , telecommunications , frequency modulation , optical modulator , bit error rate , transmission (telecommunications) , phase noise , analog signal , optical amplifier , engineering , acoustics , detector , decoding methods , channel (broadcasting) , pulse (music) , laser , programming language
We propose a new optical transmitter which is capable of changing flexibly the modulation format of the optical signal. By using this transmitter, we can handle and assign various modulation formats: binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 8-ary quadrature amplitude modulation (8QAM), and 16QAM. The proposed transmitter is based on a combination of a dual-drive Mach-Zehnder modulator (DD-MZM) and a dual-parallel MZM (DP-MZM) with electrical binary drive signals. DD-MZM is a key element to produce the 8QAM and 16QAM formats where each arm of DD-MZM is driven by independent binary data. This is because we can modulate the amplitude and phase of the optical signal by using a frequency chirp of the modulator when we adjust properly the amplitudes of the electrical drive signals. In addition, we show an algorithm by which the proposed transmitter can intelligently select the modulation format in accordance with the signal quality.