Title :
Format Conversion From 120-Gb/s RZ-D8PSK to 80-Gb/s RZ-DQPSK Through FWM-Based Optical Phase Erasure
Author :
Lu, Guo-Wei ; Tipsuwannakul, Ekawit ; Lundström, Carl ; Karlsson, Magnus ; Andrekson, Peter A.
Author_Institution :
Dept. of Microtechnol. & Nanosci. (MC2), Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
An optical format conversion scheme from 120-Gb/s return-to-zero differential 8-ary phase-shift keying (RZ-D8PSK) to 80-Gb/s RZ differential quadrature phase-shift keying (RZ-DQPSK) is demonstrated by optically removing one tributary through optical phase erasure. It is achieved through four-wave mixing in a highly nonlinear fiber. An 8-dB sensitivity improvement is obtained for the converted DQPSK signal relative to that of the input D8PSK signal. This is potentially useful to enable the interconnection among neighboring networks where different formats are deployed.
Keywords :
multiwave mixing; optical communication equipment; optical fibre networks; optical information processing; quadrature phase shift keying; RZ-DQPSK; bit rate 120 Gbit/s; bit rate 80 Gbit/s; four-wave mixing; nonlinear fiber; optical format conversion; optical phase erasure; optical signals; return-to-zero differential quadrature phase-shift keying; Fiber nonlinear optics; Optical fibers; Optical mixing; Optical sensors; Phase shift keying; Differential 8-ary phase-shift keying (D8PSK); differential quadrature phase-shift keying (DQPSK); format conversion; four-wave mixing (FWM); optical fiber communications; phase modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2087322
