1,720,975 research outputs found
Amplification of 12 OAM Modes in an air-core erbium doped fiber
No full textWe theoretically propose an air-core erbium doped fiber amplifier capable of providing relatively uniform gain for 12 orbital angular momentum (OAM) modes (|L| = 5, 6 and 7, where |L| is the OAM mode order) over the C-band. Amplifier performance under core pumping conditions for a uniformly doped core for each of the supported pump modes (110 in total) was separately assessed. The differential modal gain (DMG) was found to vary significantly depending on the pump mode used, and the minimum DMG was found to be 0.25 dB at 1550 nm provided by the OAM (8,1) pump mode. A tailored confined doping profile can help to reduce the pump mode dependency for core pumped operation and help to increase the number of pump modes that can support a DMG below 1 dB. For the more practical case of cladding-pumped operation, where the pump mode dependency is almost removed, a DMG of 0.25 dB and a small signal gain of >20 dB can be achieved for the 12 OAM modes across the full C-band
Optical amplifiers for space division multiplexed transmission
No full textSpace division multiplexing (SDM) utilizing few-mode fibers or multicore fibers supporting multiple spatial channels, is currently under intense investigation as an efficient approach to overcome the current capacity limitations of high-speed long-haul transmission systems based on single mode optical fibers. In order to realize the potential energy and cost savings offered by SDM systems, the individual spatial channels should be simultaneously amplified with associated SDM amplifiers. In this paper, a review of recent progress on the implementation of various SDM amplifiers for SDM transmission is provided and strategies to minimize the differential modal gain in few-mode erbium doped fiber amplifiers (FM-EDFAs) are presented. In particular, the performance of both core-pumped and cladding-pumped 6-mode EDFAs will be discussed in detail and the prospect of further scaling with respect to the number of spatial modes that can be amplified will be described
Compact higher-order mode converter based on all-fiber phase plate segment
Full text linkWe 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
Widely tunable actively mode-locked Bi-doped fiber laser operating in the O-band
No full textHere, we propose an all-fiber actively mode-locked Bismuth (Bi)-doped fiber laser based on the use of an acousto-optic modulator. The mode-locked Bi-doped fiber laser produces 13ns pulses with a repetition rate of 1.683MHz at 1340nm. Higher harmonic mode-locking is achieved simply by changing the operating frequency of the acousto-optic modulator. The output power of the laser is 7mW and this is further amplified to 101mW using an external Bi-doped fiber amplifier. A peak power of 4.6W with a pulse energy of 60nJ is achieved after the master oscillator power amplifier. The stability of the laser is studied using an RF spectrum analyzer and an SNR of more than 60dB at the fundamental frequency of 1.683MHz was recorded. Furthermore, wavelength tuning of the Bi-doped fiber laser is explored and demonstrated from 1300 to 1370nm
3-port fibre optic beam splitters for space division multiplexed systems
No full textWe present two fully functional 3-port 3 dB beam splitters: one for few mode fibres and another for multicore fibres. Both devices have an excess loss of <2 dB, with the latter having crosstalk values <-32 dB for all cores.</p
Dataset for: Controllable duration and repetition-rate picosecond pulses from a high-average-power OP-GaAs OPO
No full textThis dataset supports the publication: Fu, Qiang et al (2020) Controllable duration and repetition-rate picosecond pulses from a high-average-power OP-GaAs OPO. Optics Express.</span
Dataset for: High power, electronically-controlled, source of user-defined vortex and vector light beams based on a few-mode fiber amplifier
No full textThe dataset includes all measured experimental data for plotting the figures in the paper "High power, electronically-controlled, source of user-defined vortex and vector light beams based on a few-mode fiber amplifier" in Photonics Research.</span
Highly efficient frequency doubling and quadrupling of a short-pulsed thulium fiber laser
No full textWe report the second harmonic generation and fourth harmonic generation of the output from a short-pulsed (~ 80 ps) thulium-doped fiber laser, generating 976 and 488 nm wavelengths with high efficiency. With a narrow-linewidth (0.5 nm) pump at a power of 3.2 W, a second harmonic power of 2.4 W was generated at 976 nm with a conversion efficiency reaching 75%. For FHG, 690 mW of power at 488 nm was obtained from frequency doubling of 976 nm with a conversion efficiency of 30%.</p
Dataset for: Ultra-short wavelength operation of thulium doped fiber amplifiers and lasers
No full textDataset supports: Chen, S, et al. (2019). Ultra-short wavelength operation of thulium doped fiber amplifiers and lasers. Optics Express.</span
- …
