Optical Transmitters for Low‐Cost Broadband Transport

Dual-wavelength narrowband all-fiber acousto-optic tunable bandpass filter based on dispersion-compensating fiber

“…A coustically induced fiber gratings (AIFGs) have the properties of wide resonant wavelength tunability, fast tuning speed and low insertion loss, which can be used in optical frequency shifters, 1) fast-tunable filters, 2) wavelength division multiplexers (WDMs), 3) tunable lasers, 4) heterodyne detection, 5) vector beam and optical vortex generation, [6][7][8] and so on. In particular, tunable dual-wavelength lasers, [9][10][11][12][13] which could be applied in WDM networks, microwave photonics and terahertz-wave generation, require dual-wavelength bandpass filters with fast tuning speed and narrow bandwidth as wavelength selectors. To date, great efforts have been made in the fabrication of all-fiber acoustooptic tunable bandpass filters (AOTBFs) with AIFGs based on the mode conversion of scalar modes.…”