Silicon Photonics Foundry Fabricated, Slow-Light Enhanced, Low Power Thermal Phase Shifter
arxiv(2024)
摘要
In this research, we developed a low-power silicon photonics
foundry-fabricated slow-light thermal phase shifter (SLTPS) where the
slow-light (SL) effect is achieved using an integrated Bragg grating (BG)
waveguide. Heating the grating induces a red shift in the transmission
spectrum, leading to an increased group index n_g during operation, which
facilitates a further reduction in the voltage needed for a π phase shift,
i.e. V_π. Additionally, we investigated a compact Mach-Zehnder
Interferometer (MZI) that incorporates the SLTPS in both arms with a phase
shifter length of 50 μm. A detailed theoretical analysis was conducted to
address the non-idealities of the SL-MZI due to uneven optical power splitting
and unbalanced loss in the two MZI arms. The V_π and power consumption
for a π phase shift (P_π) of the SL-MZI were quantified for operation
in the slow light regime, demonstrating a V_π of 1.1 V and a P_π of
3.63 mW at an operational wavelength near the photonic band edge. The figure of
merit (FOM) P_π×τ is commonly used to assess the performance of
thermal optical switches. The SL-MZI in this work has achieved a low P_π×τ of 5.1 mW μs. Insertion loss of the SL-MZI ranges from 1.3 dB
to 4.4 dB depending on the operation wavelength, indicating a trade-off with
the V_π reduction.
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