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.
In this paper, we propose bend insensitive fiber designs that can meet both the bend loss and mechanical reliability needs for silicon photonic packaging. To improve the bend loss, we adopt profile designs with a low index trench that allow us to reduce the bending loss while keeping the mode field diameter compatible with the standard single mode fiber. To improve the mechanical reliability, we put a Titania-doped glass layer on the surface of the fiber cladding, which improves the fiber reliability under tight bending conditions. We describe both the core and Titania layer designs and present results on fiber optical and mechanical performances.
We demonstrate wavelength-division multiplexed (WDM) and mode-division multiplexed (MDM) transmission over a
fiber recirculating loop comprising of a 25-km span of low differential mode group dispersion (DMGD) few-mode fiber
carrying the LP01 and LP11 mode groups, and an inline few-mode erbium-doped fiber amplifier (FM-EDFA) providing
low mode-dependent gain (MDG) per span. We successfully transmitted a 10λ × 6 × 28-Gbaud QPSK signal over a
distance of 700 km.
Over the past decades, discrete or distributed Fiber Optic Sensing (FOS) applications have seen an increased acceptance
in many areas. High level optical and mechanical reliability of optical fiber is necessary to guarantee reliable
performance of FOS. In this paper, we review recent research and development activities on new specialty fibers. The
main approaches to enhancing fiber attributes include new refractive index profile design and fiber coating
modification.
Over the last several years, Fiber Optic Sensor (FOS) applications have seen an increased acceptance in many areas
including oil & gas production monitoring, gyroscopes, current sensors, structural sensing and monitoring, and
aerospace applications. High level optical and mechanical reliability of optical fiber is necessary to guarantee reliable
performance of FOS. In this paper, we review recent research and development activities on new specialty fibers. We
discuss fiber design concepts and present both modeling and experimental results. The main approaches to enhancing
fiber attributes include new index profile design and fiber coating modification.
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