JCS_V4_N4_RevP3 Rahul Parganiha Sharad Mohan Shrivastava Pooja Sharma Prachi Agrawal Anuja Mishra Journal on Communication Engineering and Systems 2277-5242 4 4 28 38 Integrated Ring Resonators, Optical Communication, Optical filters, WDM, MEMS In the recent years, optical networks has been proved out to be very efficient and faster compared to traditional satellite and wired network. Optical filters are needed for dynamic allocation and bandwidth selectivity of input signals in these networks. For filtering, micro ring Resonators are considered best due to their various advantages such as small size, light weight, effective operational capability and inexpensiveness. Integrated ring resonators are compact, integrated micro structures which can be used for Multiplexing/Demultiplexing, Modulation/ Demodulation, Switching and filtering of optical signals. This paper gives an overview of applications of Ring Resonators in modern optical communication system especially with Micro Electro Mechanical Systems (MEMS). We have focused this study in the field of optical filters. Structure and characteristics along with recent inventions and works done in this field has been summarized. The objectives for this survey paper are, 1) to explain basic structure, working principle, parameters and coupling configurations of optical ring resonator, 2) to discuss recent work done in the field of MEMS actuated optical filters and their characteristics and 3) to explore future scope for optical filters in communications. August - October 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3714