Author Affiliations
1State Key Laboratory of Modern Optical Instrumentation, Center for Integrated Optoelectronics, College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China2College of Optical and Electronic Technology, China Jiliang University, Hangzhou, Zhejiang 310018, Chinashow less
Fig. 1. Designed waveguide. (a) Cross section; (b) simulated field distribution of TM polarization
Fig. 2. Desired far field distribution of the designed and the detailed structure of the auxiliary waveguides. (a) Desired waveguide array with auxiliary waveguides (expected sinc field distribution in the output of a single array waveguide and the flat-topped field distribution in the output image plane are indicated in the figure); (b) detailed structure of auxiliary waveguides
Fig. 3. Field distribution with the conventional design and optimal design at the image plane
Fig. 4. Microscope pictures of the fabricated AWGR. (a) AWGR with auxiliary waveguides; (b) AWGR without auxiliary waveguides
Fig. 5. Pictures of the fabricated waveguides. (a) Microscope picture of the connection area of the waveguide array with auxiliary waveguides and the output FPR; (b) SEM image of the SiON waveguide cross section
Fig. 6. Transmission spectra of the designed 7×7 AWGR with auxiliary waveguides. (a) Edge input channel; (b) central input channel
Fig. 7. Transmission spectra of the conventional 7×7 AWGR. (a) Edge input channel; (b) central input channel
Fig. 8. Insertion loss for all output channels of the two 7×7 AWGRs. (a) Edge input channel; (b) central input channel
Fig. 9. Transmission spectra of each input channel when light is input backward
Fig. 10. Insertion loss comparation when light is input forward and backward
Parameter | Value |
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Number of channels | 7 | Central wavelength, λc /nm | 1550 | Channel spacing, Δλ /nm | 3.20 | Free spectral range, FSR /nm | 22.40 | Diffraction order, m | 57 | Length increment, ΔL /μm | 58.50 | Pitch of adjacent arrayed waveguides, da /μm | 5 | Pitch of adjacent input/output waveguides, dr /μm | 4 | Length of FPR, R /μm | 138.55 | Number of arrayed waveguides, Nwg | 31 |
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Table 1. Parameters of the 7×7 AWGR
Year | Material | Number of channels | Channel spacing /GHz | Insertion loss /dB | Non-uniformity /dB | Crosstalk /dB | Size /(mm×mm) |
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2006[21] | SiO2 | 32 | 50 | 4.65 | 0.92 | 30 | 48×80 | 2008[7] | Polymer | 8 | 200 | 2.50 | 1.40 | < 25 | 45×14.5 | 2009[14] | SiO2 | 64 | 50 | 5.40 | 1.40 | 23 | 59×62 | 2015[17] | SOI | 8 | 800 | — | 1.10 | 10 | — | 2018[20] | SOI | 15 | 200 | — | 0.46 | 15 | — | This paper | SiON | 7 | 400 | 3.82 | 0.88 | 18 | 1×1.25 |
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Table 2. Summary of the research on AWGRs