Single-sideband modulated radio-over-fiber system based on long period fiber grating |
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| Authors: | Haidong You Li Pei Tigang Ning Jing Li Long Yang Song Gao Hongyao Chen |
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| Affiliation: | 1. Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China;2. Science and Information College, Qingdao Agricultural University, Qingdao 266109, Shandong Province, China |
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| Abstract: | We present a prototype for optical single-sideband (SSB) modulated radio-over-fiber (RoF) system by employing a long period fiber grating (LPFG). A LPFG with 13.78 nm base width of transmission spectrum and 0?23.2 dB of transmission depth was designed by using commercial software. Then it is used in RoF SSB modulation scheme. In the scheme, a Mach?Zehnder modulator modulates the light wave with millimeter-wave driving signals to realize optical double-sideband (ODSB) modulation, the generated ODSB modulation signals pass through a LPFG. Due to the negative slope in transmission spectrum, the lower sideband experiences higher attenuation than the upper sideband. Thus the conversion from ODSB to optical single sideband with carrier (OSSB + C) can be easily achieved by using only one LPFG. Also, the carrier to sideband ratio (CSR) can be reduced by using a LPFG, results show the CSR can be decreased from 12.49 dB to 1.1 dB. |
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| Keywords: | Long period fiber grating Modulation Radio over fiber |
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