PANDA polarization maintaining (PM) fibers for tight bend applications are presented that can satisfy both optical and mechanical characteristics. Optical optimization of conventional-cladding structures and trench-cladding structures is discussed regarding effective cutoff wavelength under short-length and tight bend conditions. Both trench-cladding PM fiber and conventional PM fiber with 80 μm cladding diameter had similar effective cutoff wavelengths for lengths of 0.5 m. Bending loss at 2 mm radius was less than 0.1 dB/turn at 1550 nm. Additionally, improved mechanical reliability by incorporating a reinforcing outer glass layer is demonstrated on PM fiber for the first time.
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