Abstract
We demonstrate generation of Cerenkov radiation at 850 nm in a higher-order-mode (HOM) fiber. The LP02 mode in this solid, silica-based fiber has anomalous dispersion from 690 nm to 810 nm. Cerenkov radiation with 3 nJ pulse energy is generated in this module, exhibiting 60% energy conversion efficiency from the input. The HOM fiber provides a valuable fiber platform for nonlinear wavelength conversion with pulse energies in-between index-guided silica-core photonic crystal fibers and air-core photonic bandgap fibers.
Highlights
Soliton self-frequency shift (SSFS) and Cerenkov radiation in optical fibers have been theoretically studied [1,2], and experimentally demonstrated in a variety of fibers in the past [3,4,5,6,7,8,9,10]
The HOM fiber provides a valuable fiber platform for nonlinear wavelength conversion with pulse energies inbetween index-guided silica-core photonic crystal fibers and air-core photonic bandgap fibers
In the case of fibers transitioning to normal dispersion at longer wavelength, SSFS is limited by the second zero dispersion wavelength (ZDW)
Summary
Soliton self-frequency shift (SSFS) and Cerenkov radiation in optical fibers have been theoretically studied [1,2], and experimentally demonstrated in a variety of fibers in the past [3,4,5,6,7,8,9,10]. The nonlinearity values of HOM fibers lie in-between silica-core PCF and air-core PBGF as they propagate light in a solid silica core but with a significantly larger Aeff than that of silica-core PCFs. the HOM fiber is able to generate soliton and red-shifted Cerenkov radiation with pulse energy on the order of 1 nJ [16,17]. The HOM fiber is a valuable platform of nonlinear wavelength conversion with pulse energies in-between index-guided silica-core PCFs and air-core PBGFs. Nonlinear wavelength conversion at or below 850 nm has been achieved through blue-shifted Cerenkov radiation at a wavelength shorter than the first ZDW [9,12,23]. The filtered Cerenkov radiation is temporally characterized by a second-order autocorrelator
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