NakuLaser Blog

Abstract : According to the special structure of fiber laser, different types of fiber laser pump sources  are proposed, and the criteria for selecting pump source and its corresponding efficiency are given. The main components of the laser are the resonant cavity, the pump source and the working substance. The pump source is the excitation source that causes the laser working medium to reach the population inversion. The process of particles from the ground state to the high energy level is called the pumping process. Common pumping methods include electric pumping, chemical pumping, optical pumping, and pneumatic pumping, while optical pumping and electric pumping are the most widely used methods. Gas lasers often use an electric pumping method as an excitation source, and optical pumping methods are widely used in solid and liquid lasers. Optical pumping uses a beam of light to illuminate the working substance so that the particles in the working substance absorb the energy of

Abstract: Erbium doped fiber amplifier was pumped by A l-free 980nm InGaAs/ InGaAsP/ InGaP high power quantum well laser.   At pump power of 20mW, the gain is 33dB, the maximum gain  coefficient is 6 . 7dB/ mW and the saturated output power is 6dBm. The gain is as a function of  fiber length and pump powers , it is also as a function of output powers. 1 Introduction With the deep development of optical communication technology, the development of erbium-doped fiber amplifier (EDFA) as a direct optical amplification technology has become the mainstream of today's research. EDFA has the compatibility of erbium-doped fiber and communication fiber, low coupling loss, good stability, high gain, high bandwidth, high efficiency, low noise, no polarization dependence, and simple structure. Due to its small size, easy to use and high practical value. Therefore, it is a key component for achieving all-optical fiber-optic communication, such as coherent optical communication, optical

Overview CivilLaser offers customizable ASE light sources designed to accommodate many different telecommunications, fiber sensing, fiber optic gyroscope, and test & measurement capabilities in the near- and shortwave infrared C+L band region. An ASE (Amplified Spontaneous Emission) broadband low coherence light source is an ideal instrument for optical component spectral measurement and system compliance testing in manufacturing and R&D environments. The new generation of ASE sources have no high frequency ripples, which makes them very useful for sensor interrogation applications. What is ASE light source? ASE light source is one type of optical light sources, where the emission is generated by Amplified Spontaneous Emission. An optical gain medium emits light spontaneously when it is optically/electrically pumped, and if the pumping of the gain medium is strong enough, the “spontaneous” emission is amplified via the “stimulated” emission – this phenomenon is cal

L-band Multi Wavelength Tunable SM Fiber Laser  Control Method L-Band 64 Wavelengths Tunable Fiber Laser 0.8nm Interval 5~8mW Power Adjustable. The wavelength tuning range of this light source covers the L-band and achieves a continuous laser output of up to 64 wavelengths (ITU-T standard wavelength, wavelength interval 100 GHz).

1030nm 100mW Single Mode Fiber Laser  Test Report The 1030nm semiconductor laser source with  single-mode fiber  output uses a high-performance butterfly semiconductor laser, combined with fiber-optic FBG frequency-locked frequency to ensure stable spectral wavelength and single-mode pigtail output.

The laser is a multi-mode fiber coupling for 785 nm semiconductor lasers. The output power stability of the coupled fiber is good, the spot mode can be greatly improved, and the collimated beam can meet the high demand for the beam. And it will be more convenient and fast in the use of optical path.

Abstract : A double-pass bi-directional(DP_BD) pump configuration is proposed for the high efficiency L-band ASE. A L-band ASE of 13.7 dBm output power and 38nm bandwidth of 1566~1604 nm where the ASE power intensity is higher than -16 dBm is obtained by selecting 1480 nm LD and heavily doped erbium fiber with optimized length simultaneously. The DP-BD ASE source has a pump conversion efficiency of 23.4% which is larger than that by double-pass forward (DPF) configuration of 11.8%. Introduction Broadband light source  based on erbium-doped fiber amplifying spontaneous emission (ASE) is a new type of light source with erbium-doped fiber amplifier ( EDFA ). Since the first commercial use of EDFA for all-optical amplification in 1993 has led to the rapid development of optical communication, broadband light sources based on erbium-doped fiber ASE have the same output spectrum as the 1.55" m-band of optical communication, and have The output spectrum is stable, the environment

Abstract: A two-stage broadband erbium-doped fiber based amplified  spontaneous emission (ASE) source is presented. By using double pass configuration and recycling backward C band ASE, the pump power for L_band ASE generation is much economized. With achirped fiber Bragg grating (CFBG ) as spectrum equalizer, a flat spectral bandwidth of 76nm is realized. Introduction Incoherent amplified spontaneouse mission (ASE) source with low spectral ripple sare widely applied in various are as such as optical device characterization, optical sensor systems, spectrum sliced dense wavelength division multiplexing (DWDM) systems, fiber-optical gyroscopes and low-coherence tomography. Erbium-doped fiber(EDF) based ASE source sare optimal choice to realize simuha- neous C-band and L-band operation. Nevertheless, since L-band is far away from the gain peak (1530nm ) of sillca-base EDF, the gain coefficient in L-band is much lower than thatin C-band (approxim ate-1vbyafactorof1O). Thus higher p

Abstract : A high efficient narrow linewidth fiber laser  based on fiber Bragg grating Fabry- Perot( FBG F- P) cavity was demonstrted. The spatial hole burning effect was restrained by fiber Faraday rotator( FR) . Two short FBG F- P cavities as narrow bandw idth filters discriminated and selected the laser longitudinal modes efficiently. Stable single frequency 1550nm laser was acquired. Pumped by two 976nm LD, the fiber laer exhib ited a 11 mW threshold. The 73mW output power was obtained upon the maximum 145mW pump power. The optica-l optical  efficciency was 50% and the slope efficiency was 55% . T he 3 dB linewidth of laser was less than 10 kHz, measured by the delayed sel-f heterodyne method with 10 km mono- mode fiber. T he high power narrow linewidth fiber lasr can be used in high resolution fiber sensor system. 1 Introduction As a  fiber laser sensor source, the narrow linewidth fiber laser has the characteristics of interference to the electromagnetic field, safety, small

The C-band  has long been considered the preferred spectrum range for commercial 5G. According to some research reports, the recent 5G test research conducted by commercial organizations tends to be higher frequency band than C band, which involves 1GHz-100GHz illuminated, unlicensed band and spectrum sharing. "In the long run, the entire width of the 1GHz sub-band to 100GHz spectrum is the key to solving 5G application problems in various scenarios. However, in the short term, due to technical challenges, spectrum applications are not universal enough, 2019 to Millimeter waves will be used for 5G services or restricted in 2020," ABI senior analyst Prayerna Raina said in an interview. At present, mobile communication services use bands below 6 GHz, so the use of high frequency for mobile broadband is still a strange field for mobile operators. Similarly, 5G antennas and base station technologies such as MIMO are currently deployed in the 6 GHz subband range, which is gen