NakuLaser Blog

Abstract : 　 Gain characteristics of small signal in  L-band Erbium-doped fiber amplifier (EDFA) are analyzed with the numerical simulation using Giles model .The results show that the optimal fiber length varies with input signal wavelength , in general , shorter wavelength demands shorter fiber length .7 m and 9 m L-band EDF are employed to construct L-band EDFAs respectively .Evaluation of EDFAs is made by experimental comparision of their amplified spontaneous emission (ASE) spectr , gains and noise figures (NF), and the results show that the fiber length is crucial for proper gain characteristic .On the basis of these numerical , experimental study and also considering their C-band characteristics , optimal ASE spectrum related to the best behavior of L-band signal amplification is presented . 1    Introduction With the advent of the network era, people's demand for information is increasing day by day, and fiber-optic communication has also flourished along the...

Abstract: In this paper, we utilized optimized C-band and L-band amplifiers to constitute a broadband CA-L erbium-doped amplifier with a parallel structure. This amplifier has a simple configuration, high-flattened gain and low noise. Meanwhile, we have realized an amplification bandwidth of over 70 nm(1 524—1 602 nm)without any broadband gain flattening component. The C-band average gain is over 30 dB and L-band gain variation is less than 2 dB. 1.  Introduction In order to meet the growing demand for communication capacity, it is a general trend to extend the dense wavelength division multiplexing system (DWDM) from the traditional c-band (1 525 to 1 5 6 5 nm) to the L-band (1 570, 1 610 nm). . The development of C + L band ultra-wideband  erbium-doped fiber amplifiers not only doubles the bandwidth of communication, but also increases the dispersion of the system compared to other methods of increasing the transmission capacity of a single channel or reducing the chann...

Abstract: This paper introduces a C-band single-pass light source structure. In the experiment, a 980nm  laser diode is used as the pumping source of the light source. The maximum output power of the pigtail of the pumping source can reach 200mw, and the output center wavelength is 979.04nm. The threshold current is 27.8 mA and the maximum pump current is 450 mA. The output power of the 980 nm laser diode pigtail increases with the increase of the laser diode current, and changes substantially linearly. 1 Introduction At present, fiber amplifiers are commonly used, and the active materials in the fibers are mainly rare earth elements such as cerium particles and cerium particles. A rare earth doped fiber amplifier can achieve a specific range of optical signal amplification. For example, erbium-doped fiber can achieve a gain of 30 nm wide around 1550 nm; erbium-doped fiber can achieve a gain bandwidth of 20-30 nm around 1310 nm. However, due to the fixed electronic structure...

Small Laser Marking Machine /Laser Engraving Machine Operating Instructions Video Instructions： 1. The rack is shipped in bulk and needs to be installed. 2. Install software: Exit anti-virus software -- Install driver -- Open engraving software -- Commissioning machine, laser open.

The main difference between the fiber laser  and the CO2 laser is that the working materials of the two are different. The working material of the fiber laser is optical fiber, and the working material of the CO2 laser is CO2, which belongs to the gas laser. In addition, the power of the two is relatively large. The difference is that fiber lasers are currently used from a few hundred watts to thousands of watts, while CO2 lasers typically   have a power range of 80W to 600W. The photoelectric conversion efficiency of fiber lasers is higher than that of CO2 lasers. Fiber lasers are superior to CO2 lasers in terms of cutting quality and speed. Fiber lasers are lower than CO2 lasers in terms of use and maintenance costs. Higher than CO2 lasers ; in addition, both fiber lasers and CO2 lasers require a chiller to cool and cool them.

Structurally, the laser requires a resonant cavity, a pump source, and the amplifier only needs to be pumped without the need for oscillation. The laser is converted into laser light by the pump light , and then the laser is continuously oscillated and amplified, and the amplifier needs to inject the signal laser in the early stage, and its function is to amplify the signal laser. The laser is a light source that can directly emit light and output an optical signal. The laser switch is controlled by the input electrical signal, and the input electrical signal is modulated into an optical signal, and then the optical signal is output. Fiber amplifier , not a light source. It converts the externally input electrical energy into pump light. When the signal light is incident, under the stimulation of the incident light, the energy level of the pump light transitions, and the energy of the pump light is transferred to the signal light, and the signal light is transmitted. The pow...

The output wavelength of a  fiber laser is determined by the gain medium, that is, what kind of doped fiber is selected. The two most common wavelengths are 1064 nm and 1550 nm, respectively.   A typical Er3+ fiber laser is tunable at 14 nm at 1536 and 1550nm.  Taking an Nd3+-doped quartz fiber laser as an example, an AlGaAs (aluminum gallium arsenide)  semiconductor laser with a wavelength of 808 nm is used as a pump source, and the laser emission wavelength of the fiber laser is 1064 nm.  Fiber Laser refers to a laser using a rare earth-doped glass fiber as a gain medium. Fiber lasers can be developed on the basis of fiber amplifiers . Under the action of pump light, high power density is easily formed in the fiber, resulting in laser The laser energy level of the working substance "particle number inversion" can form a laser oscillation output when a positive feedback loop (constituting a resonant cavity) is appropriately added.