Samir Ghosh

Polarization-analyzing circuit on InP for integrated Stokes vector receiver

Stokes vector modulation and direct detection (SVM/DD) has immense potentiality to reduce the cost burden for the next-generation short-reach optical communication networks. In this paper, we propose and demonstrate an InGaAsP/InP waveguide-based polarization-analyzing circuit for an integrated Stokes vector (SV) receiver. By transforming the input state-of-polarization (SOP) and projecting its SV onto three different vectors on the Poincare sphere, we show that the actual SOP can be retrieved by simple calculation. We also reveal that this projection matrix has a flexibility and its deviation due to device imperfectness can be calibrated to a certain degree, so that the proposed device would be fundamentally robust against fabrication errors. A proof-of-concept photonic integrated circuit (PIC) is fabricated on InP by using half-ridge waveguides to successfully demonstrate detection of different SOPs scattered on the Poincare sphere.

High-Speed Carrier-Injection-Based Polarization Controller With InGaAlAs/InAlAs Multiple-Quantum Wells

We demonstrate a waveguide-based polarization controller that monolithically incorporates an active InGaAlAs/ InAlAs multiple-quantum-well phase shifter and a passive half-ridge polarization converter on InP. The butt-joint active/passive integration technique and self-aligned waveguide fabrication steps are employed. Using the fabricated device, efficient rotation of the Stokes vector over

Integrated stokes vector analyzer on InP

\pi

Reconfigurable 3-Channel All-Optical MIMO Circuit on Silicon Based on Multi-Plane Light Conversion

radian is obtained on the Poincare sphere by injecting 14-mA current to a 1.4-mm-long phase shifter. Dynamic response time below 5 ns is also confirmed, demonstrating the feasibility of low-power high-speed integrated polarization controller on InP.