Highly compact polarization-independent grating coupler.
We propose a compact polarization-independent output grating coupler, which consists of T-shaped grooves. For only 20 periods on a silicon-on-insulator wafer with a 260nm thick top silicon layer, the output coupling efficiencies for both the TE and the TM modes are larger than 50% in the wavelength range of 1480-1580nm and are approximately 58% around 1550nm. The polarization-dependent loss of the device is within 0.05dB in the range of 1510-1580nm.
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology,No. 1037, Luoyu Street, Wuhan 430074, China.
Shiqian
S
Shao
Yi
Y
Wang