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A few-mode Cr-doped crystalline core fiber (FMCDCCF) with high-index glass as a cladding is demonstrated. The FMCDCCF exhibits a core diameter of 34 and a -value of 3.4, which could guide about two linear modes in theory, namely the and modes in fiber. A 4.1-dB gross gain of the FMCDCCF at wavelength of 1400-nm was obtained. Further study on higher gain is...
The reduction of the number of modes existed in fiber is the key to enable a high performance fiber laser and fiber amplifier. In this study, we are attempting to fabricate few-mode dual-clad crystal fibers.
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