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A fixed phase tunable directional coupler based on coupling tuning.

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  • 1Quantum Photonics Laboratory, Centre for Quantum Computation and Communication Technology, RMIT University, Melbourne, VIC, 3000, Australia.

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Summary
This summary is machine-generated.

This study introduces an optimized tunable directional coupler (TDC) for photonic integrated circuits. The new TDC design allows arbitrary reflectivity tuning with a stable phase, overcoming limitations of Mach-Zehnder interferometers (MZIs).

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Area of Science:

  • Photonics
  • Integrated Optics
  • Materials Science

Background:

  • Photonic integrated circuits (PICs) require high-performance reconfigurability.
  • Conventional tunable directional couplers (TDCs) cannot maintain phase during reflectivity tuning.
  • Mach-Zehnder interferometers (MZIs) are used but suffer from fabrication sensitivity, hindering scalability.

Purpose of the Study:

  • To introduce and optimize a novel TDC design.
  • To enable arbitrary reflectivity tuning with stable phase.
  • To address the scalability limitations of MZIs in PICs.

Main Methods:

  • Design of a TDC based on coupling constant tuning.
  • Utilizing the thin-film Lithium Niobate (TFLN) platform.
  • Optimization of the TDC design parameters.

Main Results:

  • The optimized TDC allows arbitrary reflectivity tuning.
  • Consistent phase is maintained across a wide wavelength range.
  • The design shows improved resilience to fabrication errors compared to MZIs and conventional TDCs.
  • Fewer bending sections are required compared to MZIs.

Conclusions:

  • The proposed TDC design offers a scalable and robust solution for reconfigurable PICs.
  • This advancement has implications for optical communication systems and quantum information processing.
  • The TFLN platform provides a suitable basis for high-performance photonic devices.