CPFSK Scheme With Multiple Modulation Indices in Optical OFDM Communication System

Author

Zhanyu Yang ; Song Yu ; Longquan Chen ; Jian Li ; Yaojun Qiao ; Wanyi Gu

Author_Institution

State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun., Beijing, China

Volume

5

Issue

6

fYear

2013

fDate

Dec. 2013

Firstpage

7902607

Lastpage

7902607

Abstract

To improve spectrum efficiency (SE) of minimum-shift keying (MSK) in orthogonal frequency-division multiplexing (OFDM) system, MSK is extended to a continuous-phase frequency-shift-keying (CPFSK) scheme with multiple modulation indices h in this paper. We theoretically prove that the available h for the proposed multiple- h OFDM-CPFSK scheme is only the multiple of 1/2. Subsequently, a simple triple- h OFDM-CPFSK scheme with h = 0, 1/2, 1 is demonstrated as an example of the proposed multiple- h OFDM-CPFSK scheme. In our proof-of-concept experiment, a 10-Gb/s triple- h OFDM-CPFSK signal and a 10-Gb/s OFDM-MSK signal are successfully transported over 1000-km standard single-mode fiber. Electrical spectrum shows that the SE of the triple- h OFDM-CPFSK scheme is about twice as much as that of OFDM-MSK. Bit-error-rate performance of the 10-Gb/s triple- h OFDM-CPFSK signal and the 10-Gb/s OFDM-MSK signal after 300- and 1000-km transmissions demonstrates a robust performance of the triple- h OFDM-CPFSK scheme in long-haul high-speed transmission.

Keywords

OFDM modulation; frequency shift keying; minimum shift keying; optical fibre communication; OFDM-CPFSK scheme; OFDM-MSK signal; bit rate 10 Gbit/s; bit-error-rate performance; continuous-phase frequency-shift-keying; distance 1000 km; distance 300 km; electrical spectrum; long-haul high-speed transmission; minimum-shift keying; orthogonal frequency-division multiplexing system; spectrum efficiency; standard single-mode fiber; Bit error rate; OFDM; Optical fiber communication; Optical modulation; Quadrature amplitude modulation; Orthogonal frequency division multiplexing (OFDM); continuous-phase frequency shift keying (CPFSK); minimum-shift keying (MSK); modulation index $(h)$; spectrum efficiency (SE);

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2013.2287563

Filename

6651683