Coherent transmission with polarization modulation

Zhiyong Chen, Aijun Liu, Xiaohu Liang +1 more

Jiangong Chen, Xia Lei, Yue Xiao +3 more

Sung Jong Park, Chang Yong Park, Tai Hyun Yoon

A scheme of optical polarization modulation of a linearly polarized infrared probe field is studied in a degenerate four-level Yb atomic system. We have observed an anomalous transmission spectra of two circular polarization components of the probe field exhibiting an enhanced two-photon absorption and a three-photon gain with comparable magnitude, leading to the lossless transmission and enhanced circular dichroism. We carried out a proof-of-principle experiment of fast optical polarization modulation in such a system by modulating the polarization state of the coupling field. The observed enhanced two-photon absorption and three-photon gain of the probe field are due to the result of competing atomic coherence effects.

Lê Nguyên Bình

Marian Apostol, Mihai Ganciu

Sergio Benedetto, Anders Djupsjöbacka, Rongqing Hui +3 more

The modulation of the state of polarization (SOP) of light has been recently proposed for transmission of information on optical fibers.1-4 Polarization-shift keying (POLSK) is suitable for both coherent and direct-detection (DD) systems. In either case, both binary and multilevel schemes are possible.