All-optical format conversion from RZ-QPSK to NRZ-QPSK

doi:10.1007/s12200-012-0268-8

Front Optoelec

2012, Vol. 5

Issue (3) : 330-333 https://doi.org/10.1007/s12200-012-0268-8

RESEARCH ARTICLE

All-optical format conversion from RZ-QPSK to NRZ-QPSK

Bingrong ZOU, Yu YU(

), Wenhan WU, Shoujin HU, Zheng ZHANG, Xinliang ZHANG

Wuhan National Laboratory for Optoelectronics, College of Optoelectonic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

We proposed and demonstrated an all-optical format conversion from return-to-zero quadrature phase shift keying (RZ-QPSK) to non-return-to-zero QPSK (NRZ-QPSK) at 40 Gb/s using a half bit delay interferometer (DI). Due to the constructive interference in the DI, the format conversion was achieved with the phase information preserved. Q penalty for the format conversion was less than 1.8 dB for I and Q data.

Keywords format conversion fiber optics communications modulation

Corresponding Author(s): YU Yu,Email:yuyu@mail.hust.edu.cn

Issue Date: 05 September 2012

Cite this article:

Yu YU,Wenhan WU,Xinliang ZHANG, et al. All-optical format conversion from RZ-QPSK to NRZ-QPSK[J]. Front Optoelec, 2012, 5(3): 330-333.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0268-8
https://academic.hep.com.cn/foe/EN/Y2012/V5/I3/330

Fig.1 Experimental setup and operation principle for format conversion from RZ-QPSK to NRZ-QPSK

Fig.2 Measured spectrum for format conversion. (a)-(c) Spectrum of original input RZ-QPSK signal, demodulated and signal; (d) - (f) spectrum of converted NRZ-QPSK signal, demodulated and signal of NRZ-QPSK

Fig.3 Eye diagrams of (a) back to back NRZ-QPSK signals modulated by a regular commercial QPSK modulator and the demodulated; (b) alternative mark inversion (AMI); (c) duobinary (DB) signal of the ; (d) AMI and (e) DB signal of the of original NRZ-QPSK. Eye diagrams of (f) original RZ-QPSK signals and the demodulated; (g) AMI and (h) DB signal of the ; (i) AMI and (j) DB signal of the of original RZ-QPSK. Eye diagrams of (k) converted NRZ-QPSK signals and the demodulated; (l) AMI; (m) DB signal of the ; (n) AMI and (o) DB signal of the of converted NRZ-QPSK

Tab.1 factor penalty results for the QPSK format conversions for and data

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