Results 21 to 30 of about 153,685 (298)
1kW fiber-coupled pump-module at 976nm with 50% efficiency
Optics Express, 2017 We present a fiber-coupled pump-module emitting more than 1kW of mode-stripped power at 976nm from a detachable 225µm, 0.22NA fiber. The electrical-to-optical efficiency at 1kW is ~50%. Six of these pump modules attached to a (6 + 1):1 multimode combiner enable a 5-6kW, single-mode, Yb-doped fiber amplifier.
R H, Chin +4 more
openaire +2 more sources
Cavity Q, mode volume, and lasing threshold in small diameter AlGaAs microdisks with embedded quantum dots [PDF]
, 2005 The quality factor (Q), mode volume (Veff), and room-temperature lasing threshold of microdisk cavities with embedded quantum dots (QDs) are investigated.
Borselli, Matthew +4 more
core +2 more sources
Compact focusing grating couplers for silicon-on-insulator integrated circuits [PDF]
, 2007 —We report experimental results on compact and broadband focusing grating couplers, both in silicon-on-insulator (SOI) and gold on SOI. An eight-fold length reduction of the coupling structure from fiber to photonic wire in SOI, as com-pared to a linear ...
Dirk Taillaert +10 more
core +2 more sources
Experimental Research on Automatic Alignment and Control Algorithm of Spatial Light-Fiber Coupling
International Journal of Optics, 2021 This study aims to solve the difficulties in the coupling between space light and single-mode fiber (SMF) in free-space optical communication. A fiber coupler based on two-dimensional (2D) piezoelectric ceramics was developed, which uses the stochastic ...
Xizheng Ke, Benkang Yin
doaj +1 more source
Coupling Efficiency of a Partially Coherent Radially Polarized Vortex Beam into a Single-Mode Fiber
Applied Sciences, 2018 We study the problem of coupling partially coherent radially polarized (PCRP) vortex beams into a single-mode optical fiber. Using the well-known concept of the cross-spectral density (CSD) matrix, we derive a general expression for the coupling ...
Xinlei Zhu +4 more
doaj +1 more source
IEEE Photonics Journal, 2023 In fiber-based optical receivers such as coherent receiver, the optical signal reaching the receiver's aperture is coupled to the optical fiber through a set of lenses.
Woohyeon Moon, Hoon Kim
doaj +1 more source
All-fiber fused directional coupler for highly efficient spatial mode conversion [PDF]
, 2014 We model and demonstrate a simple mode selective all-fiber coupler capable of exciting specific higher order modes in two- and few-mode fibres with high efficiency and purity. The coupler is based on inter-modally phase-matching the propagation constants
Brambilla, Gilberto +4 more
core +1 more source
Efficient low-threshold lasers based on an erbium-doped holey fiber [PDF]
, 2005 We report experimental results on the continuous-wave lasers based on a small core erbium-doped holey fiber. In a simple Fabry-Perot-type cavity with high output coupling, we demonstrate low-threshold (0.55 mW) high slope-efficiency (57.3%) operation ...
Furusawa, K. +5 more
core +1 more source
Coupled fiber taper extraction of 1.53 um photoluminescence from erbium doped silicon nitride photonic crystal cavities [PDF]
, 2010 Optical fiber tapers are used to collect photoluminescence emission at ~1.5 um from photonic crystal cavities fabricated in erbium doped silicon nitride on silicon. Photoluminescence collection via fiber taper is enhanced 2.5 times relative to free space,
Akahane +27 more
core +2 more sources
IEEE Photonics Journal, 2014 A broadband electrically tunable variable polarizer for fiber systems based on a liquid crystal lens is proposed and demonstrated. The polarization selectivity is based on a polarization-sensitive coupling efficiency to the fiber in the fiber system. For
Michael Chen +4 more
doaj +1 more source