Title :
An All-Optical Modulation Format Conversion for 8QAM Based on FWM in HNLF
Author :
Banghong Zhang ; Hongyu Zhang ; Changyuan Yu ; Xiaofei Cheng ; Yong Kee Yeo ; Pooi-Kuen Kam ; Jing Yang ; Hongguang Zhang ; Yu-Hsiang Wen ; Kai-Ming Feng
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
In this letter, we propose and experimentally demonstrate an all-optical modulation format conversion scheme from amplitude shift keying (ASK) and quadrature phase shift keying (QPSK) to 8-ary quadrature amplitude modulation (8QAM), using four-wave mixing (FWM) effect in highly nonlinear fiber. In the FWM process, a 20-Gbits/s return-to-zero QPSK (RZ-QPSK) signal and a 10-Gbit/s ASK signal are utilized as probe light and pump light, respectively. A 30-Gbits/s RZ-8QAM signal, which is the idler light, is successfully obtained with optical signal-to-noise ratio larger than 30 dB and bit-error rate lower than 10-5.
Keywords :
amplitude shift keying; error statistics; multiwave mixing; optical fibre communication; optical modulation; optical pumping; quadrature amplitude modulation; quadrature phase shift keying; 8-ary quadrature amplitude modulation; ASK signal; FWM process; HNLF; RZ-8QAM signal; RZ-QPSK; all-optical modulation format conversion scheme; amplitude shift keying; bit rate 10 Gbit/s; bit rate 20 Gbit/s; bit rate 30 Gbit/s; bit-error rate; four-wave mixing effect; highly nonlinear fiber; optical signal-to-noise ratio; pump light; quadrature phase shift keying; return-to-zero QPSK signal; Amplitude shift keying; Bit error rate; Nonlinear optics; Optical fibers; Phase shift keying; Probes; 8-ary quadrature amplitude modulation (8QAM); cross phase modulation (XPM); four-wave mixing (FWM); highly nonlinear fiber (HNLF);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2236547
