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

Volume

23

Issue

14

fYear

2011

fDate

7/15/2011 12:00:00 AM

Firstpage

977

Lastpage

979

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);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2011.2148703

Filename

5759068