Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
851184 | Optik - International Journal for Light and Electron Optics | 2008 | 5 Pages |
Abstract
A wavelength division multiplexer (WDM) for 980/1550 nm based on planar curved waveguide coupler (CWC) is proposed. Compared with conventional parallel straight waveguide coupler (SWC), this structure has more flexibility with two variable parameters of bending radius R and minimum edge-to-edge spacing d0, which are the two main parameters for the splitting ratio of coupler and decrease the complexity of device design and fabrication. Based on coupled mode theory (CMT) and waveguide theory, R and d0 of the WDM CWC are designed to be R=13.28 m and d0=4.39 μm. The contrast ratio (CR) and insertion loss (IL) for 980 and 1550 nm are CR1=24.62 dB, CR2=24.56 dB and IL1=0.014 dB, IL2=0.015 dB, respectively. The 3D beam propagation method (BPM) is used to verify the validity of the design result. The influence of R and d0 variations on the device performance is analyzed. For CR>20 dB, the variation ranges of R and d0 should be within â0.10 to +0.44 m and â0.05 to +0.02 μm, respectively.
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Authors
Xiu-you Han, Fu-fei Pang, Hai-wen Cai, Rong-hui Qu, Zu-jie Fang,