Waveguide-detector couplers for integrated optics and monolithic optoelectronic switching arrays

Area of Science:

• Optoelectronics
• Integrated photonics
• Waveguide technology

Background:

• Integrated waveguide-detector couplers (IWDCs) are crucial for controlling optical power in integrated photonic circuits.
• Previous research has focused on various coupling mechanisms, but efficient integration with detectors remains a challenge.

Purpose of the Study:

• To investigate the performance of an integrated waveguide-detector coupler (IWDC).
• To demonstrate the application of IWDCs in an optoelectronic switching matrix.

Main Methods:

• Fabrication of a rib waveguide using Corning 7059 glass on a silicon substrate.
• Integration of a photoconductive detector on the same substrate.
• Controlled coupling achieved by tapering SiO(2) cladding thickness and varying interaction length.

Main Results:

• Measured coupling values ranging from 400 to 1500 dB/cm for TE modes and up to 5800 dB/cm for TM modes.
• Demonstration of the first integrated optoelectronic 2x2 switching matrix utilizing IWDCs.
• Achieved passive power splitting close to the ideal 50% in the integrated switch.

Conclusions:

• The developed IWDC offers efficient and controllable optical power coupling for integrated photonic applications.
• The successful demonstration of a 2x2 switching matrix highlights the potential of IWDCs in complex optoelectronic systems.