Design and simulation of a planar integrated demultiplexer for coarse WDM

• Published in: Optics communications 2003-09, Vol.225 (1), p.95-100
• Main Authors: Sheng, Zhongyan, He, Sailing, Lou, Lifang
• Format: Article
• Language: English
• Subjects: Applied sciences; Coarse wavelength division multiplexing; Demultiplexing; Exact sciences and technology; Flat-top spectral response; Multi-mode fiber; multimode fiber; Optical communication systems, multiplexers, and demultiplexers; Optical planar waveguides; spectrograph; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); wavelength demultiplexer
• ISSN: 0030-4018; 1873-0310; 1873-0310
• DOI: 10.1016/j.optcom.2003.07.035

A planar integrated demultiplexer is designed for coarse wavelength division multiplexing (WDM) applications. The demultiplexer chip has no input or output waveguides, and simply consists of a single-mode slab waveguide and a concave reflective grating. The grating is strictly designed to diffract the multiplexed input light and focus different wavelengths on different positions on a cutting edge of the chip. A single-mode input fiber and some multi-mode output fibers are located on the cutting edge, being used as input and output channels. A numerical simulation is given to verify a design of an 8-channel CWDM chip. The results show that this demultiplexer has good focused output fields, a low loss, and a good spectral response with flat-top wide passband.