Optical properties improvement on AWG Achieved by Adding Transmission Star Couplers into FPR1

Abstract

In this paper, we present the improvement of optical properties of lx8 arrayed waveguide grating (A WG) de multiplexer by adding Transmission Star Couplers (TSC) into Free Propagation Region 1 (FPR1) which has refractive index 1.455. It is found that the appropriate value of refractive index of TSC area is 1.460. Using this method, the insertion loss of A WG decreased from 1.79 dB to 1.58 dB while the crosstalk increased from -23.94 dB to -22.49 dB. To maintain the problem of the increased crosstalk, the traditional output guide structure is replaced by a taper structure which has start width 11 /lm and end width 6 /lm. Then, the insertion loss is reduced from 1.58 dB to 1.09 dB, and the crosstalk is reduced from -22.49 dB to -24.94 dB, respectively. Therefore, by using all design concepts, the appropriate structure of proposed A WG can be achieved. The size of the proposed A WG is the half of that of the traditional A WG, and the insertion loss of the proposed A WG is lower than that of the traditional A WG.

Highly Utilized Fiber Plant with Extended Reach and High Splitting Ratio Based on AWG and EDFA Characteristics

“…The array, which contains a number of different waveguide lengths, is placed in the middle of the two free propagation regions. A smaller AWG with an insertion loss on the order of 1.09 dB was proposed by Tippinit and Asawamethapant [23]. If an optical signal carrying an aggregation of wavelengths propagates in the first free propagation region, the aggregation will arrive at the input of the second propagation region with different phases, due to the different waveguide lengths.…”

“…The company C2V developed a silicon-based AWG model with an insertion loss of 1.26 dB, but the main drawback of this model was its large size. A smaller AWG with an insertion loss on the order of 1.09 dB was proposed by Tippinit and Asawamethapant [23].…”

A Frequency Reuse-Based Design for Flexible and Scalable Passive Optical Networks (PONs)

“…However, the main drawback with this model was its large size. Janvit Tippinit and Weerachai Asawamethapant spent considerable efforts and proposed a smaller AWG with a lower insertion loss of 1.09 dB [9]. An N×N AWG has two main properties [10].…”