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All-optical microwave photonic filters using a Hi-Bi chirped fiber Bragg grating

G. NING1,* , P. SHUM1, S. ADITYA1

Affiliation

  1. Network Technology Research Centre, Nanyang Technological University, 50 Nanyang Drive, Research Techno Plaza, Singapore – 637553

Abstract

We propose novel microwave photonic notch filter configurations using high-birefringence (Hi-Bi) chirped fiber Bragg grating (CFBG), together with their application in a 20 km single mode fiber (SMF) radio-over-fiber (RoF) link. Expressions are derived for 2-tap low-pass and bandpass filter transfer functions, including the effect of the fiber in the RoF link and the modulator chirp parameter. We demonstrate that the effect of chromatic dispersion due to the Hi-Bi CFBG can be either reduced or enhanced in a RoF link and that this effect can be used to improve the filter performance in a RoF link. Measured results are presented for both low pass and bandpass filter operations, including the effect of reduced or enhanced chromatic dispersion. A notch rejection greater than 30 dB and tuning of free spectral range (FSR) by tuning the Hi-Bi CFBG are demonstrated. The filter configurations are free from optically coherent interference and phase noise..

Keywords

Microwave photonics, Radio-over-fiber, High-birefringence, Chirped fiber Bragg grating.

Submitted at: Dec. 7, 2006
Accepted at: Aug. 18, 2007

Citation

G. NING, P. SHUM, S. ADITYA, All-optical microwave photonic filters using a Hi-Bi chirped fiber Bragg grating, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 8, pp. 2321-2326 (2007)