Authors: MC Parker SD Walker
Publish Date: 2014/04/23
Volume: 73, Issue: 5-6, Pages: 635-645
Abstract
Devices such as the planar arrayedwaveguide grating or the distributed Bragg reflector AWG and DBR respectively are assuming increasing importance in the areas of fibre pointtopoint communication and networking In the particular context of dense wavelengthdivision multiplexing DWDM these devices play a wellestablished role as wavelengthselective elements More recently chirped variants have found use as dispersion compensators offering wideband reduction of both basic and higherorder departures from constant group delay However up to the present time the existence of a systematic approach to higherorder dispersion compensation has not been recognised Additionally we have identified a comprehensive isomorphism between AWG and DBR devices that allows the design characteristics of the former transverse geometry to be mapped on to the latter longitudinal structure Here we present a systematic study of these important passive optical gratingbased devices which considers firstly analytic solutions for 2ndorder dispersion compensation DC and then 3rd and 4thorder dispersion compensators with 100 GHz bandwidth We then review optimisation strategies for DC 3 dB bandwidth and passband dispersion ripple as determined by device chirp apodisation coupling strength and polyphase transfer function superposition We conclude with a preliminary discussion of grating parametric sensitivity as evidenced by Monte Carlo analysis
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