Overwritten fiber Bragg grating and its application in an optical single sideband with carrier modulation radio over a fiber system

Details Overwritten fiber Bragg grating and its application in an optical single sideband with carrier modulation radio over a fiber system Overwritten fiber Bragg grating and its application in an optical single sideband with carrier modulation radio over a fiber system

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011opten..50c5001n&link_type=abstract

Optical Engineering, Volume 50, Issue 3, pp. 035001-035001-4 (2011).

Physics

Optics

Bragg Gratings, Intensity Modulation, Radio-Over-Fibre, Optical Communication Systems, Multiplexers, And Demultiplexers, Gratings, Fiber Optics, Optical Processors, Correlators, And Modulators

Scientific paper

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.

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