Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 21, Issue 16, Pages 1118-1120Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2009.2023678
Keywords
InAlGaAs-InAlAs compound semiconductor; Mach-Zehnder (MZ) interferometer photonic switch; multimode interference (MMI) coupler; polarization independence
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [19023010]
- Grants-in-Aid for Scientific Research [19023010] Funding Source: KAKEN
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In this letter, we demonstrated a Mach-Zehnder interferometer-type photonic switch using multimode interference (MMI) couplers with InAlGaAs-InAlAs compound semiconductor materials. A hybrid-waveguide structure with different etching depths was adopted for MMI couplers and other parts of the waveguides for polarization-independent operation. As a result, low-crosstalk switching operation of less than -20 dB was confirmed regardless of polarizations of an input light. Switching currents were, respectively, 5.25 and 4.75 mA for TE and TM modes of the input light. High-speed switching operation with about 3-ns transition time was also confirmed.
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