Article

All-optical transversal filter with tap doubling and negative coefficients based on polarization modulation.

Department of Information and Communications, Gwangju Institute of Science and Technology 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Korea.
Optics Express (impact factor: 3.59). 06/2007; 15(10):5898-904. pp.5898-904
Source: PubMed

ABSTRACT A novel all-optical transversal filter with negative coefficients and tap doubling is proposed and experimentally demonstrated. Based on polarization modulation using the anisotropy of the electro-optic coefficient of LiNbO(3) crystals, negative and positive coefficients are simultaneously generated. Tap doubling is also achieved by using wavelength- and polarization-dependent time delays in fiber. Due to the orthogonal polarity between the two coefficients of each wavelength, the proposed filter is free from coherent interference and the synthesis of filter taps is performed in the optical domain. The experimental results demonstrated that stable 6-tap bandpass filter characteristics can be obtained by using only three optical sources.

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Keywords

coherent interference
 
experimental results
 
filter taps
 
negative
 
negative coefficients
 
novel all-optical transversal filter
 
optical domain
 
polarization modulation
 
polarization-dependent time delays
 
stable 6-tap bandpass filter characteristics
 
tap doubling
 
three optical sources
 
two coefficients
 

Choong K Oh