Continuous-wave operation of an erbium-doped short-cavity composite fiber laser (original) (raw)

Characterization of a high-power erbium-doped fiber laser

In this paper we investigate the properties of a 10 W double-clad Er:Yb doped fiber amplifier in two laser setups. It is first studied an all-fibered continuous laser. A laser efficiency of 20 % is obtained with an output power of about 8 W for 40 W pumping power. A passively mode-locked fiber laser is then built up. In the anomalous dispersion regime it is obtained a soliton crystal involving some hundreds of solitons. We demonstrate that the soliton crystal becomes unstable for higher pumping power resulting in its dislocation.

Continuous-wave and giant-pulse operations of a single-frequency erbium-doped fiber laser

IEEE Photonics Technology Letters, 2000

We present a compact diode-pumped single-frequency single-polarization erbium-doped fiber laser with fiber Bragg gratings (FBGs) written in the active fiber itself. The single-polarization regime was obtained by applying uni-axial stress to one of the two FBGs forming the cavity. The laser is shown to operate in two regimes-quasi-continuous-wave regime with a few-percent of modulation in the output power and a giant-pulse regime accessible under sinusoidal pump modulation.

Multiwavelength operation of an erbium-doped fiber laser by using in-fiber comb filters

This paper explains the principles behind multiwavelength operation of an erbium-doped fiber laser (EDFL) under the combined effect of cavity phase modulation and periodic wavelength filtering. A mathematical model is developed to simulate the behaviour of the multiwavelength EDFL, both in time and frequency domains. The effects of various parameters such as pump power, filter channel spacing, modulation index and frequency are observed and explained. An all-fiber EDFL was constructed, using a piezo-transducer-based phase modulator and a Sagnac loop periodic filter, to validate the theoretical results. The effects of pump power, modulation frequency and modulation index were monitored experimentally, justifying the theoretical explanation. The multiwavelength EDFL has several potential applications in fiber sensing due to its flexible all-fiber design.

Continuous Wave and Pulsed Erbium-Doped Fiber Lasers for Microwave Photonics Applications

2000

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Erbium-Doped-Fiber Characterization: Dynamic Study of Laser Ring Cavity Based on a General Model

Journal of Lightwave Technology, 2000

ABSTRACT In this paper, we propose and demonstrate an original exploitation of relaxation oscillations of erbium-doped-fiber laser ring resonators based on a general model for Er cross-sectional characterization. Its main advantage as compared to other existing exploitations relies on the fact that only weak approximations relative to spatial light distribution in the laser are imposed. It is therefore applicable to various resonator configurations, i.e., independent of the active-media length and losses encountered during the single-pass loop propagation. An experimental demonstration is finally presented by comparing the extracted erbium parameters (intrinsic saturation power and absorption) to those obtained with other methods.

Multiwavelength Operation of Erbium-Doped Fiber Lasers by Periodic Filtering and Phase Modulation

Journal of Lightwave Technology, 2000

Characterization and optimization criteria for filterless erbium-doped fiber lasers

Journal of The Optical Society of America B-optical Physics, 1994

The emission wavelength of a unidirectional ring erbium-doped fiber laser (EDFL) with no filters has been characterized. A measurement of the emission and the absorption erbium-doped fiber cross sections together with a theoretical model based on the solution of the rate equations for the ring laser shows that the laser emission wavelength depends on the cold-cavity losses or on the active fiber length and dopant concentration. The threshold pump power, the output power, and the slope efficiency of the EDFL have been measured and theoretically evaluated versus cold-cavity loss and active fiber length. A simple relation among loss, active fiber length, and dopant concentration that permits the design of the cavity with the maximum slope efficiency has been found.

Simulation and Computer Modeling of a Diode pumped Erbium-Ytterbium (Er3+/Yb3+) Co-doped Fiber Laser

The International Conference on Mathematics and Engineering Physics

Fiber lasers technology has grown rapidly due to the rapid advances in high power diodes, diode-to-fiber coupling schemes and doped fiber design and fabrication. Erbium-Ytterbium (Er 3+ /Yb 3+) co-doped fiber is an attractive active medium for the fiber lasers in which Ytterbium is co-doped with Erbium to produce a spectrum in third telecoms window around 1550nm which makes them suitable sources for long range applications. In this paper the Er 3+ /Yb 3+ fiber laser pumped by a laser diode at 980 nm is simulated using the Optiwave software. The pump source was swept from 1.25 to 5 w to extract the slope efficiency. The pump radiation was focused into the Er 3+ /Yb 3+ fiber through an input mirror, which was 98% reflecting at 1550 nm and 99% transmitting at 980 nm. A length of 0.1 m of Er 3+ /Yb 3+ fiber was used with an N.A. of 0.22, Er 3+ ion density of 25.4 x 10 24 m-3 , and Yb 3+ ion density of 320 x 10 24 m-3. The output mirror was 50% reflecting at 1550 nm. Then the length of the fiber was swept from 1m to 5m in order to obtain optimized fiber length. The simulation results demonstrated that a laser output power of 0.8 W was obtained at 1550 nm for a launched power of 2 W with a slope efficiency of 40% and a lasing threshold of 0.4 W of launched pump power. The results also showed that the optimized fiber length was achieved at 2 m which is in a good agreement with the published similar experimental schemes.

Eect of Incorporating A FBG In L-Band Erbium-Doped Fiber Laser

The eect of incorporating a fiber Bragg grating (FBG) in long wavelength band erbium-doped fiber laser (L-band EDFL) is investigated. The EDFLs with and without the FBG operate at wavelength of 1579.3 and 1591.9 nm, respectively. At low pump power, the system without the FBG shows a lower threshold and a better slope eciency compared to that of the system with the FBG. However, the out- put power is reduced at higher pump power due to the mode competition in the cavity. By incorporating the FBG in the laser cavity, the side mode suppression ratio (SMSR) of the laser is significantly improved and a higher output power can be obtained at high pump power. At pump power of 99 mW, the EDFL with the FBG has output power of 11.9 dBm, a 3 dB bandwidth of 0.06 nm and a SMSR of 59 dB.

Continuous-wave operation of an erbium-doped short-cavity composite fiber laser (original) (raw)

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