Open AccessOptical transmitter for 320-Gb/s PDM-RZ-16QAM generation using electrical binary drive signals
Author(s) -
Hyeon Yeong Choi,
Takehiro Tsuritani,
Ramon Casellas
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.028772
Subject(s) - quadrature amplitude modulation , transmitter , physics , phase shift keying , optics , electro optic modulator , modulation (music) , binary number , phase modulation , telecommunications , computer science , bit error rate , optical modulator , phase noise , mathematics , acoustics , channel (broadcasting) , arithmetic
We propose a new 16QAM optical transmitter based on a combination of a dual-drive Mach-Zehnder modulator (DD-MZM) and a dual-parallel Mach-Zehnder modulator (DP-MZM) with electrical binary drive signals. For 16QAM generation, two arms of DD-MZM are independently driven by two different binary data, and consequently, the DD-MZM produces an offset square 4QAM of the 16QAM constellation. This 4QAM signal is then switched over other quadrants through a typical QPSK modulation scheme by the following DP-MZM, and resulting in 16QAM. By using the proposed transmitter together with a digital coherent receiver, we successfully demonstrate the 224-Gb/s and 320-Gb/s PDM-RZ-16QAM systems. Their OSNR sensitivities at 3.8x10(-3) BER are observed to be 19.8 dB and 23 dB, respectively.