研究目的
To demonstrate fully integrated optical isolators using bonded Ce:YIG on silicon microrings with an integrated electromagnet for TE mode operation and wide tunability.
研究成果
The demonstrated microring isolator operates for TE mode with >20dB isolation tunable between 1540 to 1580nm. It is widely tunable across the full FSR, making it suitable for WDM applications. Future work could involve designing for specific FSRs and adding a second polarization rotator for better PIC integration.
研究不足
The polarization rotator introduces ~1-2dB loss, and total insertion loss is ~7dB. Incomplete polarization rotation and polarization extinction ratio limitation of the PM lensed fiber I/O cause residual TE polarized light. Isolation bandwidth is relatively small (2GHz), requiring tunability to match laser wavelengths.
1：Experimental Design and Method Selection:
The design includes a TE->TM polarization rotator before the isolator, utilizing an adiabatic coupler and linear taper with Ce:YIG upper cladding for mode hybridization. FDTD simulations were used for design validation. The isolator is based on a microring with integrated electromagnet for nonreciprocal phase shift.
2：Sample Selection and Data Sources:
Fabricated on a standard 220nm thick SOI wafer with bonded Ce:YIG die. Samples were characterized using a tunable laser sweep for transmission spectra and isolation measurements.
3：List of Experimental Equipment and Materials:
SOI wafer, Ce:YIG die, Ti/Au for electromagnet deposition, PM lensed fiber I/O, tunable laser.
4：Experimental Procedures and Operational Workflow:
Fabrication involved patterning SOI, bonding Ce:YIG, substrate thinning, and depositing Ti/Au electromagnet. Measurements included injecting TE polarized light, sweeping current to the electromagnet, and recording transmission and isolation.
5：Data Analysis Methods:
Analysis of transmission spectra, isolation ratio, bandwidth, and tuning mechanisms (magneto-optic and thermal effects) using experimental data.
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