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We report the generation of radially polarized laser pulses from a gain-switched diode-seeded Yb-doped fiber MOPA system delivering 110ps pulses at a repetition rate of 1.367MHz with up to 25.8μJ pulse energy.
We review and compare recent hollow core photonic crystal fibers, both bandgap-guiding and anti-resonant, which were designed and fabricated for high power laser delivery applications.
We present in-service inter-core crosstalk monitoring for MCF transmission systems. We transmit 54-WDM PDM-16QAM signals over 111.6-km 32-core DSDM transmission line incorporating cladding-pumped 32-core MC-EYDFA, and demonstrate −30 dB crosstalk monitoring without affecting transmission performance.
We present a novel approach for providing low-loss optical interconnection between multicore fibers having dissimilar core pitch. Using simple image formation by a graded index fiber lens a significant core pitch difference (36μm and 29μm) is compensated with low coupling loss (∼1.5dB).
We report the fabrication of a multicore fiber attenuator in which the attenuation of each core is independently set using fs-laser inscription. An exemplar 4-core device with ∼1 dB loss-variation between adjacent cores is demonstrated.
580μJ nanosecond pulses at a repetition rate of 25kHz with user-defined temporal pulse shapes and a radially polarized doughnut-shaped spatial mode have been demonstrated in an Yb-doped fiber MOPA system seeded by a super-luminescent diode.
We report a low loss (∼12.3dB/km), 37-cell hollow-core photonic bandgap fiber operating in the 1μm spectral region and demonstrate its bend-insensitive operation and its use for high power laser beam delivery.
We discuss our recent progress in hollow core-photonic bandgap fiber fabrication for high capacity transmission, focusing on two key areas: longitudinal uniformity and length upscaling as well as reviewing highlight results in data transmission.
We present a suite of silica-based thulium-doped fiber amplifiers (TDFAs) operating across the 1650–2050nm waveband. High gain and low NF are achieved by combining several TDFA designs optimized for short, central and long wavelength operation.
We present for the first time wideband operation of an optical orbital angular momentum amplifier with topological charge |l|=1. An air-core erbium-doped fiber is fabricated and up to 15.7dB gain is obtained with a cladding-pumped configuration.
We propose a simple design of LP11 spatial mode converter by splicing an all-fiber binary phase plate segment between SMF and FMF. More than 13dB modal extinction ratio was successfully achieved with 4.5dB insertion loss over a wide wavelength range.
4×10Gbps WDM transmission over low loss HC-PBGF at 2μm wavelengths is demonstrated using a 2mm long QCSE based InP MZM with Vπ of 6V and ER>20dB. An OSNR of 25dB is required to achieve error free transmission.
We demonstrate mode-multiplexed transmission over all-fiber optically amplified spans of 215 km and 179 km for 3 and 6 spatial modes, respectively. The spans were amplified using two cladding-pumped few-mode fiber amplifiers.
We review the performances of both core and cladding pumped few-mode erbium doped fiber amplifiers supporting 6 spatial modes (4 mode groups) which incidentally the highest mode count demonstrated to date.
We report the realization of a wideband holmium doped fiber amplifier designed for optical communications over 2050 – 2130 nm, providing up to 28 dB small signal gain and 4 – 9.5 dB noise figure.
We demonstrate a six spatial-mode, wavelength-routing network interoperable with few-mode, coupled-multi-core, and single-mode fiber spans using a custom 57-port wavelength-selective switch configured for joint-switching of spatial-superchannels.
We report the first demonstration of silica-based thulium-doped fiber amplifier (TDFA) working in the 1.65 – 1.7 µm waveband. Up to 29 dB small signal gain and noise figure as low as 6.5dB are achieved.
We report the first demonstration of in-band diode-pumped silica-based thulium-doped fiber amplifiers working in the 1.7–1.8 μm waveband. Compared to previously reported results, 90 nm gain extension has been achieved by exploiting novel amplifier designs.
We present a 3-moded cladding-pumped multi-element fiber amplifier comprising 4 Er/Yb doped signal fibers and 1 multimode pump-delivery fiber with spatial multiplicity of 12. An average signal gain of 18dB and differential modal gain of 2–5dB are achieved.
This paper presents WDM transmission at 2μm over 1.15km of HC-PBGF with wavelength channels selected to span a 36.3nm waveband. A total capacity of 81Gbit/s was achieved using 4×12.5Gbit/s NRZ-OOK external modulation and 4×7.7Gbit/s 4-ASK Fast-OFDM direct modulation signals.
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