33results about How to "Wide gain bandwidth" patented technology

An optical amplifier system is disclosed comprising a discrete amplifier system and a distributed amplifier system. The discrete amplifier system receives optical signals and amplifies the optical signals having wavelengths in a target wavelength band. The target wavelength band has a bandwidth of at least 80 nm. The distributed amplifier system amplifies the optical signals having wavelengths in a longer wavelength band of the target wavelength band, a shorter wavelength band of the target wavelength band, or both.

Raman optical fiber amplifier is composed of four pieces of Raman optical fiber laser modules of outputting different wavelength, three pieces of pump light wavelength division multiplexer in different central wavelengths of input channel, and pump opto-isolator. Raman optical fiber laser modules as pump laser modules through pump light wavelength division multiplexes (9), (10), (11) and pump opto-isolator inject into pump / signal wavelength division multiplexer (7). Output from pump / signal wavelength division multiplexer (7) is injected to transmission optical fiber. Finally, Raman amplification is carried out for signal light in C+L band being passed through signal opto-isolator. Advantages are: stable and reliable performance, high Raman conversion efficiency, and favorable ratio of performance, wider gain bandwidth, quick response speed and flexible configuration.

The invention discloses a reflection array radiation unit, which belongs to the technical field of antennas. It includes a dielectric substrate and a metal pattern layer printed on one side of the dielectric substrate; the metal pattern layer adopts a multi-ring nested structure, including multiple phase factor adjustment rings and several phase compensation rings located on the periphery of the phase factor adjustment ring. The single-layer printing structure reduces the process difficulty of multi-layer printing technology, reduces the dielectric loss and reduces the processing cost. Compared with the traditional unit, its phase compensation ability is increased by 4-6 times, and the traditional reflection array The focal-diameter ratio is reduced to 0.5 or even lower; the structural size of each reflectarray unit can be optimized in the entire working frequency band, so that its phase can be compensated on demand, thereby expanding the gain bandwidth of the reflectarray antenna. The invention also discloses a planar reflectarray antenna composed of the above-mentioned reflectarray radiating unit.

A broadband optical parametric chirped-pulse amplifier applicable to the technical field of lasers. The amplifier comprises a narrow-band picosecond laser (70), a pulse laser stretcher (10), an optical coupling mirror (20), a beam expansion / contraction system (30), a periodically poled crystal (40), a spectroscope (50), and a pulse laser compressor (60), wherein the periodically poled crystal (40), which has a periodical domain inversion structure, is used for separating generated idler light from a chirped-pulse laser / pump light so as to suppress energy backflow after the broadband optical parametric chirped-pulse amplifier enters the stage of saturated amplification; and thus, the broad optical parametric chirped-pulse amplification of a broadband is realized. The broadband optical parametric chirped-pulse amplifier not only suppresses the backflow of signal light energy, but also has a very broad gain bandwidth as a result of the simultaneous optimization between pulse energy (conversion efficiency) and pulse width (gain bandwidth), such that the outputtable peak power of the broadband optical parametric chirped-pulse amplifier is greatly increased, and the performance of the optical parametric chirped-pulse amplifier is improved.

The invention provides bismuth-doped silicophosphate-based optical glass and a preparation method thereof. The preparation method comprises the following steps of: uniformly mixing the following components in percentage by mole: 34.9-64.9 percent of SiO2, 8-20 percent of P2O5, 15-35 percent of Al2O3, 15-45 percent of RO and / or RCO3 and 0.1-5 percent of Bi2O3; heating the mixture to 1,300-1,600 DEG C, preserving heat for 30-180 minutes and melting the raw material to be in a liquid state; and annealing at 500-650 DEG C for 0.5-6 hours, and naturally cooling to room temperature to obtain the bismuth-doped silicophosphate-based optical glass. The bismuth-doped silicophosphate-based optical glass has the ultra-broadband optical performance of covering an entire communication waveband, the melting temperature is remarkably lowered relative to quartz glass, and the viscosity of the melting liquid in the melting process of the glass is lowered, so that the defects (such as air bubbles and the like) in the melting and molding processes of the glass are reduced compared with those of quartz glass, the mechanical performance of the glass is improved, and infrared illumination intensity of bismuth in the glass is high.

The invention provides a control device of a power factor correcting circuit and a control method. The power factor correcting circuit (200) is driven by the input of an input circuit (100), the control device comprises a sampling circuit (300), a driving circuit (400) and a control circuit (500), wherein the control circuit (500) comprises a processing unit (510), the sampling circuit (300) acquires the status signal of the power factor correcting circuit (200), and sends the signal to the processing unit (510), the processing unit (510) controls the output parameters of the control circuit (500) according to the status signal so as to control the driving circuit (400), and the driving circuit (400) outputs corresponding driving signals so as to control the power factor correcting circuit (200). The invention has the advantage that the control has sufficient phase margin, wide gain bandwidth and high gain.

Quasi-parametric chirped-pulse amplifier comprising a signal path, a pump path, and an amplifier. A dedicated nonlinear crystal doped with rare-earth-ions is used which has strong absorption around the idler waveband. Both the chirped signal pulse and the pump pulse incident into the amplifier, where energy continuously transfers from the pump pulse to the signal pulse and a newly generated idler pulse. The energy of the generated idler pulse is continually absorbed by the rare-earth ions doped in the amplifier.