| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Optical 90° Hybrid Based on an InP 4×4 Multimode Interference Coupler for Coherent Receiver Application |
| LIU Wei-Hua1**, ZHAO Yan-Li1, XU Cheng-Zhi1, ZHAO Jian-Yi1, LIU Wen1, XU Yuan-Zhong2 |
1Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
2Wuhan Telecommunication Device Co. Ltd., Wuhan 430074 |
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| Cite this article: |
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LIU Wei-Hua, ZHAO Yan-Li, XU Cheng-Zhi et al 2012 Chin. Phys. Lett. 29 064210 |
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Abstract An optical 90° hybrid based on an InP 4×4 multimode interference (MMI) coupler is designed and fabricated for the application in a coherent receiver. It reveals that the width of multimode waveguide is the most critical parameter for the devices, and the multimode waveguide width can be accurately controlled within 0.1 μm in our experiments. Across the entire C-band (1527–1561 nm), the maximum imbalance of the devices is less than 0.7 dB, and the common mode rejection ratios for in-phase channels and quadrature channels are better than -24 dB.
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| Keywords:
42.82.Et
42.82.Bq
42.82.Cr
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Received: 12 January 2012
Published: 31 May 2012
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| PACS: |
42.82.Et
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(Waveguides, couplers, and arrays)
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42.82.Bq
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(Design and performance testing of integrated-optical systems)
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42.82.Cr
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(Fabrication techniques; lithography, pattern transfer)
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