研究目的
Investigating the development of a compact polarization diversity circuit for a silicon waveguide device to suppress polarization dependence in optical switches.
研究成果
A 4×8 polarization diversity circuit using photonic crystal waveplates was fabricated, and polarization diversity 4×4 optical switches were configured. The fluctuation in the loss was 1.1 dB and the crosstalk was less than ?17 dB for 125 different states of polarization for all switching paths. The wavelength dependence of the loss within the C-band was about 3 dB for each switching path.
研究不足
The total loss was large due to difficulties in butt coupling the silica-based diversity circuit and the silicon optical switch because of their rough surfaces. However, these losses can be significantly reduced by using a silica waveguide with higher refractive index difference and assembling the chips closer together.
1：Experimental Design and Method Selection:
The study proposes a polarization diversity circuit consisting of silica waveguides and photonic crystal waveplates to convert input light with various polarization states into two output light signals with the same polarization.
2：Sample Selection and Data Sources:
The experiment involves fabricating polarization diversity circuits for a 4×4 silicon optical switch.
3：List of Experimental Equipment and Materials:
Includes silica waveguides, photonic crystal waveplates, and a 4×4 silicon optical switch.
4：Experimental Procedures and Operational Workflow:
The polarization diversity circuits are set at the front and rear of two silicon optical switches to measure the loss fluctuation and crosstalk for various states of polarization.
5：Data Analysis Methods:
The loss and crosstalk characteristics are defined and measured for different states of polarization.
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