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Huang HJ, Balčytis A, Dubey A, Boes A, Nguyen TG et al. Spatio-temporal isolator in lithium niobate on insulator. Opto-Electron Sci 2, 220022 (2023). doi: 10.29026/oes.2023.220022
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Abstract
In this contribution, we simulate, design, and experimentally demonstrate an integrated optical isolator based on spatiotemporal modulation in the thin-film lithium niobate on an insulator waveguide platform. We used two cascaded travelling wave phase modulators for spatiotemporal modulation and a racetrack resonator as a wavelength filter to suppress the sidebands of the reverse propagating light. This enabled us to achieve an isolation of 27 dB. The demonstrated suppression of the reverse propagating light makes such isolators suitable for the integration with III-V laser diodes and Erbium doped gain sections in the thin-film lithium niobate on the insulator waveguide platform.-
Keywords:
- Isolator /
- lithium niobate /
- modulator
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References
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Huang HJ, Balčytis A, Dubey A, Boes A, Nguyen TG et al. Spatio-temporal isolator in lithium niobate on insulator. Opto-Electron Sci 2, 220022 (2023). doi: 10.29026/oes.2023.220022
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Figure 1.
(a) Illustration of the investigated spatiotemporal isolator in LNOI. (b) Cross-section of the SiN loaded LNOI waveguide. (c) Purple curve shows the simulated spectral response of the add-drop racetrack resonator with an FSR of 55 GHz. Black line is the simulated spectral response for light propagating in the forward direction for a modulation index of 0.77π/2 when the device meets the condition of Eq. (2). (d) Black line is the simulated spectral response for the reverse direction assuming a modulation index of 0.77π/2. The response of the add-drop racetrack resonator is shown in (c) and (d) for reference and is not considered in the black curves.
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Figure 2.
(a) Optical microscope image of the fabricated isolator. (b) Magnified view of the racetrack resonator coupling region. (c) The traveling wave electrode alignment to the waveguide. (d) SEM image of the fabricated SiN loaded LNOI waveguide.
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Figure 3.
(a) The blue curve shows the measured transmission spectrum of the racetrack resonator. The red curve shows the measured spectrum of the cascaded phase modulators for light travelling in the reverse direction; Measured spectra of the isolator when operating the device in the (b) reverse direction and (c) forward direction, when using the racetrack resonator to suppress sidebands.
