Acousto-optic tapped delay-line filter

Abstract

An acousto-optic tapped delay-line finite-impulse-response filter that operates at a system intermediate frequency without requiring a reference optical beam is introduced. Principles of operation are theoretically derived and used to model the system frequency response and multiple-tap cross-talk performance. As an element of this derivation, a focused optical illumination of a diverging acoustic wave is analyzed. Experimental results are also provided for a multichannel acousto-optic tapped delay line operational over a 10-MHz bandwidth at an 80-MHz intermediate frequency.

Hierarchical optical ring interconnection (HORN): scalable interconnection network for multiprocessors and multicomputers

“…Remote communication takes place when the source and destination PE's are not in the same hierarchical group: H͑1, a͒ source H͑1, b͒ destination , where a b. The key to the routing used in remote communication is the use of acousto-optic tunable filters ͑AOTF's͒, 20,21 located in the switching nodes, that are able to route on individual wavelengths. AOTF's, therefore, can be thought of as optical switches.…”

“…Other features that make AOTF's ideal for interconnection networks are their electronic tuning with a fast scan rate and wide tuning range without secondary passbands, allowing it to route on multiple wavelengths. 20,21 Moreover, the combined capabilities of a wide tuning range and relatively large throughput of acousto-optic tunable filters make them favorable for the HORN interconnection. Because of page limitations we defer a detailed description of the optical implementation of the proposed HORN architecture to a subsequent paper.…”

Hardware Demonstration of Extremely Compact Optical True Time Delay Device for Wideband Electronically Steered Antennas

“…Free-space approaches typically use a series of spatial light modulators to select the paths for arrays of beams [18]- [20] or acousto-optic modulation [21], [22]. The advantage of free space is low weight and equal ease of implementing long and short delays.…”

Hierarchical optical ring interconnection (HORN): a scalable interconnection-network for multiprocessors and massively parallel systems

“…where a b. The key to the routing used in remote communication is the use of acousto-optic tunable filters ͑AOTF's͒, 20,21 located in the switching nodes, that are able to route on individual wavelengths. AOTF's, therefore, can be thought of as optical switches.…”