Title :
75-km SMF Transmission of Optical 16 QAM Signal Generated by a Monolithic Quad-Parallel Mach–Zehnder Optical Modulator
Author :
Chiba, Akito ; Sakamoto, Takahide ; Kawanishi, Tetsuya ; Higuma, Kaoru ; Sudo, Masaaki ; Ichikawa, Junichiro
Author_Institution :
NICT, Tokyo, Japan
fDate :
7/15/2011 12:00:00 AM
Abstract :
We demonstrate 75-km single-mode fiber transmission of a 40-Gb/s optical 16-level quadrature amplitude modulation (16QAM) signal generated by a quad-parallel Mach-Zehnder optical modulator (QPMZM), where four Mach-Zehnder structures are embedded in parallel monolithically on a lithium niobate substrate. Owing to the optical 16QAM signal generation method based on the coherent superposition in the QPMZM and improved coherent receiver utilizing digital filters, improvement of receiver sensitivity has been achieved as well. The experimentally obtained receiver sensitivity for near the forward-error correction limit and power penalty due to transmission are experimentally evaluated as 16.3 dB and about 2-3 dB, respectively.
Keywords :
digital filters; forward error correction; integrated optics; light transmission; optical fibre communication; optical filters; optical information processing; optical modulation; optical receivers; quadrature amplitude modulation; Mach-Zehnder structures; SMF transmission; bit rate 40 Gbit/s; coherent receiver; coherent superposition; digital filters; distance 75 km; forward-error correction; lithium niobate substrate; monolithic embedding; monolithic quad-parallel Mach-Zehnder optical modulator; optical 16-level QAM signal generation; power penalty; quadrature amplitude modulation; receiver sensitivity; single-mode fiber transmission; Nonlinear optics; Optical attenuators; Optical fibers; Optical filters; Optical polarization; Optical receivers; Coherent superposition; lithium niobate; monolithic quad-parallel Mach–Zehnder optical modulator (QPMZM); optical quadrature amplitude modulation (QAM);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2148703
