Advanced fiber Bragg gratings for microwave photonics applications

Abstract

Owing to the unique features of flexible spectral characteristics, low loss, light weight, compact footprint, and compatibility with other fiber-optic elements, fiber Bragg gratings (FBGs) have been extensively used in various microwave photonics systems. In this work, the recent development in employing advanced FBGs for various microwave photonics applications are reviewed, with emphasis on microwave arbitrary waveform generation and photonic microwave filtering. An innovative FBG sensor interrogation scheme using microwave photonics techniques is also presented.

Microwave photonic filtering based on optical carrier suppression modulation

“…For instance, two laser sources exploit the phenomena of four‐wave mixing (FWM) inside a highly nonlinear fiber to generate multiple taps . Multiple wavelengths are realized by using broadband source with fiber Bragg grating (FBG) . Microwave photonic filter based on multiwavelength Brillouin‐erbium fiber laser (BEFL) has been demonstrated in References , where the free spectral range (FSR) can be tuned by varying the Brillouin gain.…”

“…[4][5][6] Multiple wavelengths are realized by using broadband source with fiber Bragg grating (FBG). 7,8 Microwave photonic filter based on multiwavelength Brillouin-erbium fiber laser (BEFL) has been demonstrated in References 9,10, where the free spectral range (FSR) can be tuned by varying the Brillouin gain. A continuously tunable microwave photonic filter based on a Sagnac loop mirror having a polarization differential delay line has been proposed in Reference 11 An infinite-impulse response filter has been proposed in Reference 12 by using a multiwavelength source, two sections of polarization maintaining fibers and three polarization controller.…”