This paper discusses the use of the acousto-optic tunable filter (AOTF) in a multiwavelength crossconnect that eliminates back-to-back optical-to-electrical and electrical-to-optical conversions in the central office. We show that the ability of the AOTF for multiple wavelength selection can be exploited to reduce the component count in a multiwavelength cross-connect.
Soung C. Liew,
"Multiwavelength optical switch based on the acousto-optic tunable filter", Proc. SPIE 1363, Fiber Optics in the Subscriber Loop, (1 January 1991); doi: 10.1117/12.24585; https://doi.org/10.1117/12.24585