All optical multi‐tap microwave filter with high sidelobe suppression using peak profile of ASE and one multiwavelength FBG

Abstract

A new all optical 10‐tap microwave filter is proposed using a broadband amplified spontaneous emission (ASE) light source and a single specially designed multiwavelength FBG. Measured results show that the sidelobe suppression is larger than 20 dB. The filter response is insensitive to the polarization state of light. This technique enables one to obtain a simple and low cost photonic microwave filter with a stable response. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2522–2524, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24666

Broadband ASE source using bismuth-based erbium-doped fibers in double-pass set-up

“…The erbium-doped fiberbased (EDF) ASE source is a good candidate for simultaneous offering broad spectral linewidth, high output power, and excellent mean wavelength stability to meet application requirements. Therefore, many works have been reported to demonstrate ASE light source using various configurations [4][5][6][7][8] in conjunction with erbium-doped fiber (EDF) as the gain medium in both of the conventional wavelength band (C-band) and the long wavelength band (L-band) regions.…”

“…In broadband RoF system, optical sources with linear characteristics in the wide frequency range are attractive for high-capacity transmission and broadband multimedia wireless service [2]. When biased at the operating point, laser diodes (LDs) and modulators exhibit nonlinear transfer functions and hence generate unwanted intermodulation and harmonic distortion products [3,4]. Most predistortion techniques in RoF systems utilize an electrical predistortion circuit in front of nonlinear optical devices making a transfer function be linear.…”