Conventional arrayed waveguide grating with 4 channel structure design for CWDM

The cost effective of coarse wavelength division multiplexing (CWDM) become more interested topic in the platform for metro networks compare to the alternative dense-WDM (DWDM), which is well established in long-haul application. Arrayed waveguide grating (AWG) is a key element for WDM system in optical communication due to ability to multiplex and demultiplex light of different wavelength. In the present work, two conventional AWGs with 4 channel were designed to operate in CWDM, where the conventional AWG usually is designed to operate in WDM or DWDM system. The devices were designed to operate at central wavelength 1.51 μm and 1.55 μm with 20 nm wavelength spacing between the channels. The maximum insertion loss for both devices is around 4.5 dB. Besides, the crosstalk for AWG with center wavelength 1.51 μm and 1.55 μm is found to be less than -32.50 dB and -30.52 dB respectively.