Recently, researchers proposed and experimentally demonstrated a novel narrow-bandwidth rectangular optical filter with reconfigurable bandwidth and tunable center wavelength.

This is one of the best results for the narrow-bandwidth rectangular optical tunable filter with reconfigurable bandwidth and can be widely used in the processing of reconfigurable signals in the optical communication networks and microwave photonics. The results were published in Opt. Express on Mar 30, 2021.

Researchers developed a novel narrow-bandwidth rectangular optical filter based on MPSFBG with reconfigurable bandwidth and tunable center wavelength. 

In the research process, the proposed MPSFBG-based filter is applied to a typical microwave photonic scheme. Using this new scheme, they found that the SNR is improved by 14.40 dB compared to the traditional Lorentz-type filter. 

“This filter can be widely used in microwave photonics and optical fiber sensing fields.” researchers said.

This work is supported by National Key R&D Program of China; Youth Innovation Promotion Association of the Chinese Academy of Sciences; National Natural Science Foundation of China; Shanghai Sailing Program; Natural Science Foundation of Shanghai.

 
Fig. 1 Schematic diagram of the experimental setup. (Image by SIOM)

Fig. 2 Application of bandwidth-reconfigurable characteristic of the MPSFBG-based filter inmicrowave photonic channelization link. (Image by SIOM)

Article website:
https://doi.org/10.1364/OE.423451