Novel structure of optical add/drop filters and multi-channel filter based on photonic crystal for using in optical telecommunication devices

Subject Areas : Journal of Optoelectronical Nanostructures

Vahid Fallahi ¹ (Faculty of Electrical Engineering, Shahid Rajaee Teacher Training University (SRTTU), Tehran, Iran.)
Mahmood Seifouri ² (Faculty of Electrical Engineering, Shahid Rajaee Teacher Training University (SRTTU), Tehran, Iran.)

Received: 2018-12-18 Accepted : 2019-06-11 Published : 2019-05-01

Keywords: Photonic Crystal, Photonic Band Gap, PWE, FDTD, Ring Resonator, Add/Drop Filter,

Abstract :

In this paper, Using a 2D photonic crystal and a novel square ring resonator,
several compact and simple structures have been introduced in the present paper to
construct optical add/drop filters and multi-channel filter. The difference structures has
been designed and simulated by using the proposed square ring resonator and different
dropping waveguides. To do analyses, the finite-difference time-domain method and the
plane wave expansion have been used. The three add/drop filters can separate the
wavelength of 1554 nm with a transmission coefficient of 100 %, quality factor of 1295
and bandwidth of 1.2 nm. The models of structures are simulated by the RSOFT CADLayout
software. The results, flexibility and simplicity of structures have caused from
their used to designing of an optical multi-channel filter with a channel spacing of 1.5
nm. The advantages of this design include the channel spacing, quality factor,
transmission coefficient and bandwidth which are suitable for applicability in optical
communication systems such as wavelength division multiplexing systems.

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