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We propose an infrared tunable dual-band polarization filter in this paper. Based on the perfect absorption characteristic of the metal-dielectric-metal sandwich structure, the reflection spectrum performs as a filter. The calculated results show that different dual-band wavelengths are filtered while the incident light has different polarization which is parallel or vertical to the x axis. Moreover,...
Phase grating structure has the ability to converge light. We have introduced it to couple with superconducting nanowire single photon detector (SNSPD) to enhance its response for light. The effects of the coupling structure parameters on the enhancement have been studied systematically by FDTD method. Our numerical simulation show that the optical density arriving on nanowires of SNSPDs can be enhanced...
We demonstrate experimentally penalty-free transmission of 127-Gb/s coherent PM-QPSK signals through 10 cascaded 50-GHz commercial WSS over 1500-km SMF. Simulation results show that more than 40 cascades of such 50-GHz liquid-crystal based WSS is feasible.
We experimentally demonstrate a PMD monitoring technique utilizing the polarizer and low-speed detector for 80-Gb/s pol-muxed RZ-DPSK. RF power increment of 16.2 dB, insensitive to 0~100 ps/nm chromatic dispersion, is measured in the presence of 0~12 ps DGD.
We propose and experimentally demonstrate an all-optical chromatic dispersion (CD) monitoring technique for phase-modulated signals utilizing the cross-phase-modulation effect between the input signal and the inserted continuous-wave probe. The probe's optical spectrum changes with the accumulated CD on the input signal, indicating that the optical power variations can be measured for monitoring....
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