This paper presents progress of collinear beam (CB) AOTFs as wavelength routing switches (WRS) in DWDM networks. Significant improvement in the CBAOTF bandpass response was achieved. The measured performance at 1550nm shows a FWHM of 0.5nm and a sidelobe bandpass below 22dB at a wavelength spacing of 0.8nm from the center wavelength. By using two cascaded dual polarization AOTFs, a 2 X 2 WRS can be constructed that yields an extinction ratio greater than 35dB.
Preliminary results of a study aimed at the development of a simultaneous signal instantaneous frequency measurement (IFM) receiver using optical implementation methods are reported. A method for detecting simultaneous signals in an IFM receiver is briefly reviewed. Two architectures (coherent and incoherent) for optical phase correlators are then described and compared. Some considerations concerning the practical implementation of the two architectures are discussed.
This paper reviews the operating principle of the acousto-optic tunable filter (AOTF) and describes some of the recent progress. A ray tracing algorithm was derived that was used to determine the image aberration due to the AOTF. The calculated result is compared with the experimental result of the AOTF configured as an electronically tuned imaging spectrometer. Due to the recent progress of AOTF technology, a wideband (10 nm) visible AOTF with a one inch aperture is now realizable.
This paper describes the application of acousto-optic (AO) spectrum analysis techniques to astronomical spectrometers. The design of a 2 GHz bandwidth AO spectrometer and the performance limitations of the technology are discussed. Two alternative architectures are proposed. The new approaches appear promising for increasing the instantaneous bandwidth to greater than 5 GHz.
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