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Optical Engineering

Overwritten fiber Bragg grating and its application in an optical single sideband with carrier modulation radio over a fiber system
Author(s): Tigang Ning; Jing Li; Pei Li; Fan Zhang; Qian Zhou; Xiaodong Wen; Chunhui Qi; Jingjing Zheng
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Paper Abstract

We present a prototype for optical single sideband (SSB) modulation with carrier (OSSB+C) by employing an overwritten fiber Bragg grating (FBG) is proposed and demonstrated. The grating is written using two different uniform phase masks of slight variation in the period. Then it is used in millimeter-wave SSB modulation scheme. Its operation principle can be concluded as the following two steps: (i) first, an intensity modulator double sideband (DSB) modulates the lightwave with millimeter-wave driving signals; (ii) then, the generated DSB modulation signals are reflected by the overwritten FBG. The overwritten FBG can reflect the carrier and the sideband simultaneously, resulting in two coherent subcarriers. Thus the conversion from DSB to OSSB+C can be easily achieved by using only one grating. Also, carrier-to-sideband ratio (CSR) can be optimized by using grating with different reflection depth. We demonstrate this scheme via simulation and successfully reduce signals' CSR from 14.44 to 1.25 dB.

Paper Details

Date Published: 1 March 2011
PDF: 5 pages
Opt. Eng. 50(3) 035001 doi: 10.1117/1.3549224
Published in: Optical Engineering Volume 50, Issue 3
Show Author Affiliations
Tigang Ning, Beijing Jiaotong Univ. (China)
Jing Li, Beijing Jiaotong Univ. (China)
Pei Li, Beijing Jiaotong Univ. (China)
Fan Zhang, Beijing Jiaotong Univ. (China)
Qian Zhou, Beijing Jiaotong Univ. (China)
Xiaodong Wen, Beijing Jiaotong Univ. (China)
Chunhui Qi, Beijing Jiaotong Univ. (China)
Jingjing Zheng, Beijing Jiaotong Univ. (China)

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