Integrated optic spectrum analyser

The integrated optic spectrum analyser (IOSA) utilises the Bragg refraction of an optical guided beam by a surface-acoustic wave to perform spectral analysis. The recent development of this device has been carried out by several groups in the USA. These researchers, while working towards similar performance goals, have each achieved varying degrees of success using differing technological implementations. The paper reviews the results of these efforts and provides an overview as to the current status of IOSA development. The paper begins with the design of the IOSA optics. Next, the techniques used for lens fabrication are discussed. This is followed by a description of the types of SAW transducers used. The detector arrays studied to date are briefly described. Finally, the performance characteristics of the IOSAs that have been developed are discussed.