Abstract
We first propose a multichannel optical filter with an ultra-narrow 3-dB bandwidth based on sampled Brillouin dynamic gratings (SBDGs). The multichannel optical filter is generated when an optical pulse interfaces with an optical pulse train based on an ordinary stimulated Brillouin scattering (SBS) process in a birefringent optical fiber. Multichannel optical filter based on SBDG is generated with a 3-dB bandwidth from 12.5 MHz to 1 GHz. In addition, a linearly chirped SBDG is proposed to generate multichannel dispersion compensator with a 3-dB bandwidth of 300 MHz and an extremely high dispersion value of 432 ns/nm. The proposed multichannel optical filters have important potential applications in the optical filtering, multichannel dispersion compensation and optical signal processing.
Highlights
Multichannel optical filters have attracted great interests thanks to their important applications in multi-wavelength fiber laser [1,2], multi-channel optical signal processing [3], optical DWDM systems [4,5], multichannel dispersion compensators [6,7]
The Brillouin grating can be generated at a specific location controlled by the delay of the two pumping pulses, and the numbers of the Brillouin dynamic grating (BDG) inside the polarization-maintaining fibers (PMFs) can be varied which is mainly decided by the repetition rate of the pulse trains adjusted shorter than the acoustic lifetime [31], i.e., ~10ns
It is worth noting that to avoid the degradation of the spectral response of the sampled Brillouin dynamic gratings (SBDG) along the time, the pumping 1 and 2 should both works at a high rate repetition rate
Summary
Multichannel optical filters have attracted great interests thanks to their important applications in multi-wavelength fiber laser [1,2], multi-channel optical signal processing [3], optical DWDM systems [4,5], multichannel dispersion compensators [6,7]. These multichannel optical filters have been successfully generated with dielectric thin-film filters, array waveguides (AWGs), Fabry–Pérot filters, fiber Bragg gratings [8,9,10], unbalanced Mach–Zehnder interferometers [11] and high birefringence fiber [12]. The properties of SBDG with and without chirps in the grating period can be utilized in WDM systems for filtering and dispersion compensation, which provides great flexibility in the design of functional WDM devices
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