22 February 2018 Adaptive detection of optical phase modulation in acetylene-filled hollow-core photonic crystal fibers
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We present a new concept of the homodyne interferometric adaptive detection of optical phase modulation. To ensure adaptivity, i.e. stabilization of the interferometer operation point, we utilize the phase memory of a two-level quantum system, resonantly illuminated with the information bearing signal wave. Phase modulation of the transmitted signal wave transforms into the intensity modulation via interference with the collinearly propagating dipole radiation of the excited two-level system. The latter acts like a reference wave since it has a phase corresponding to that of the signal wave but averaged over the transverse relaxation time T2 of the quantum system. Experimental demonstration with the acetylene-filled hollow-core micro-structured optical fiber at the communication wavelength of 1530nm of the acetylene P9 absorption line is presented. It is shown that the response to the introduced phase modulation is quadratic when the acetylene inhomogeneously broadened absorption line is excited in its center and is a linear one if it is excited at one of the absorption line sides.
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Serguei Stepanov, Serguei Stepanov, Nayeli Casillas, Nayeli Casillas, Manuel Ocegueda, Manuel Ocegueda, Eliseo Hernández, Eliseo Hernández, } "Adaptive detection of optical phase modulation in acetylene-filled hollow-core photonic crystal fibers", Proc. SPIE 10548, Steep Dispersion Engineering and Opto-Atomic Precision Metrology XI, 1054804 (22 February 2018); doi: 10.1117/12.2299218; https://doi.org/10.1117/12.2299218

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