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A modal interferometer was proposed to realize multi-channel mode conversion in two mode fiber. The near-filed pattern confirmed the LP01 mode was converted into LP11 mode at the destructive wavelengths. The mode conversion was realized at 20-channels in the C+L wavelength band with conversion efficiency up to 99.5% and insertion loss lower than 0.6 dB.
A $C$ -band tunable erbium-doped fiber laser is proposed and experimentally demonstrated by cascading two twin-core fiber (TCF)-based directional couplers. Two TCF-based couplers have different TCF lengths and gave rise to a dense fringe pattern modulated by a sparse one. The lasing wavelength was coarsely tuned by bending one TCF-based coupler with TCF length of 0.14 m, and finely tuned by stretching...
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