All-fiber acousto-optical tunable filtering technology for optical communication

Abstract

List of Figures 2.1 Schematic of all-fiber acousto-optic tunable filter operation principle. 2.2 Experimental setup of single-stage AF-AOTF 2.3 Piezoelectric transducers and horns for AF-AOTF 2.4 Acoustic transducers for AF-AOTF 2.5 Transmission of single-stage AF-AOTF 2.6 Schematic of two fiber-optic Acousto-optical devices 2.7 Schematics for several basic all-fiber acousto-optical tunable filter.. . 2.8 Second order derivatives of the transmission F with respect to a.. . 2.9 Relationship between o Q L and CL for the maximally flat stopband filter 35 2.10 The optimized value of aL for the AF-AOTFs with different isolation. 2.11 Transmission of maximal flat stopband filters with different bandwidths but same transmission isolation of-5dB 41 2.12 Transmission of maximal flat stopband filters with different transmission isolations 42 NANYANG TECHNOLOGICAL UNIVERSITY SINGAPORE ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library Vlll 3.1 Composite transmission profile of a two-stage cascading structure AF-AOTF (designed at 1705nm) 62 3.2 Composite transmission profile of a two-stage cascading structure AF-AOTF (designed at 1005nm) 63 3.3 Composite transmission profile of a four-stage cascading structure AF-AOTF (designed at 1705nm) 65 3.4 Effect of strain on the performance of flat-stopband transmission.. . 66 3.5 Composite transmission profile of two-stage AF-AOTF subject to strain difference control and frequency difference control (initially designed at 1500nm) 75 3.6 Composite transmission profile of two-stage AF-AOTF subject to strain difference control and frequency difference control (initially designed at 1600n?n) 76 3.7 Composite spectral responses of a two-stage cascading AF-AOTF subject to frequency difference and strain difference control schemes with consideration of the PZT nonlinearity 81 3.8 Composite transmission profile of two-stage AF-AOTF subject to strain difference control at the calibrated wavelength (A c = 1543nm). 82 3.9 Composite transmission profile of two-stage AF-AOTF subject to strain difference control at different central wavelengths (curve 1: