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A 1310 nm InGaAlAs/InP V-cavity laser (VCL) is proposed and experimentally demonstrated. The laser is ultra-compact with a device size of only 520μm×300μm. Measurement result shows that 38×100GHz tuning range with above 30dB side-mode suppression ratio (SMSR) is achieved.
Here we demonstrate, to the best of our knowledge, a tunable 1.5 μm narrow linewidth fiber ring laser using a temperature tuning π-phase shifted fiber Bragg grating (π-PSFBG) for the first time. The π-PSFBG is employed as both a narrow band filter and a wavelength tuning component by a thermo electric cooler (TEC). The tuning range of the laser is 1.29 nm with the precision of 14 pm/°C, and the maximum...
A 1.5 μΜ tunable CW single-frequency seed laser is injected into the methane-filled negative curvature hollow-core fiber, and then amplified by stimulated Raman scattering of methane molecule. The Stokes linewidth is measured at the output using a scanning Fabry-Perot interferometer. When the wavelength of the seed laser is tuned to the Stokes transition and the polarization direction of the seed...
Coherent optical receivers have been widely used in free-space optical communication. We report on a coherent receiver with a homodyne optical phase-locked loop using a Costas loop. Differing from the conventional configuration, the demonstration in this paper with enhanced dynamic performance using an auxiliary acquisition and locking circuitry is able to achieve fast phase locking to signal laser...
A single longitudinal mode (SLM) fiber ring laser based on a semicircular single mode fiber (SSMF) structure is proposed. In the fiber ring laser, a piece of erbium doped fiber (EDF) pumped by a 980 nm semiconductor laser diode (LD) through a wavelength division multiplexer (WDM).A fiber Bragg grating (FBG) is used as a filter. And a commercial single mode fiber (SMF)is bent into semicircular structure...
A wavelength-tunable Erbium-doped fiber laser with birefringence-enhanced cavity is proposed. A 45° tiled fiber grating (45°TFG) and a section of polarization maintaining (PM) fiber are placed between two two polarization controllers (PCs). Two PCs and PM fiber are employed to enhance the birefringence effect. The 45° TFG plays the role of an in-fiber polarizer. The fiber laser is mode-locked by single...
Recent progress in development of broadly tunable Cr:ZnSe lasers for trace gas detection is reported. With an intracavity CaF2 prism, the CW Cr:ZnSe laser was tuned within a total wavelength range of 427 nm from 2164 nm to 2591 nm. And, the applied research about trace gas sensing based on Mid-IR broadly tunable Cr:ZnSe lasers has been discussed in this paper, which indicated that a single-frequency...
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