High Resolution Grating-Assisted Acousto-Optic Tunable Filter

摘要

An experimental acousto-optic tunable filter that has a narrow spectral bandwidth(0.2 nm at 1550 nm) and a fast (10 micro sec) tuning capability with a continuous tuning range of 52 nm is described. By combining a conventional diffraction grating with an acousto-optic beam deflector in a transverse configuration, spectral bandwidth has been significantly reduced and the number of usable wavelength channels within the erbium-doped fiber amplifier (EDFA) passband is increased by approximately 20 times. The filter also permits simultaneous and independent selection/routing of many wavelength channels for multi-channel wavelength division multiplexing (WDM) filters/routers/switches or fast scan optical spectrum analyses.