Silicon photonic circuit with polarization diversity

Area of Science:

• Photonics
• Integrated Optics
• Materials Science

Background:

• Polarization diversity is crucial for stable optical signal transmission.
• Existing silicon photonic devices often require complex fabrication processes.
• Achieving polarization independence in integrated photonic circuits remains a challenge.

Purpose of the Study:

• To design and fabricate a silicon photonic circuit with polarization diversity.
• To develop polarization splitters and rotators using planar fabrication technology.
• To demonstrate a polarization-independent wavelength filter for optical communication applications.

Main Methods:

• Devised a silicon photonic circuit incorporating polarization splitters (directional couplers) and polarization rotators (off-axis double-core structure).
• Utilized planar fabrication technology for device manufacturing, avoiding complex 3D structures.
• Integrated these components with a ring resonator to create a polarization-independent wavelength filter.

Main Results:

• Successfully fabricated polarization splitters and rotators using standard planar processes.
• The fabricated polarization-independent wavelength filter exhibited approximately 1 dB polarization-dependent loss.
• Demonstrated stable 10-Gbps data transmission through the device with scrambled polarization.

Conclusions:

• The developed silicon photonic circuit with polarization diversity is effective for creating polarization-independent devices.
• Planar fabrication of polarization splitters and rotators simplifies manufacturing for integrated photonics.
• The demonstrated wavelength filter shows promise for reliable high-speed optical communication systems.