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The output power of solid pulse laser drops as time increases, theoretical analysis is carried out from gain bandwidth for this kind of phenomenon. The normalization output power analytical model is deduced under homogeneous broadening condition, and numerical calculation and analysis is carried out, the result shows that, the widen of gain bandwidth and gain central frequency drift makes output power...
The relative gain intensity and corresponding permitted parametric of optical parametric oscillator based on periodically poled RbTiOAsO4 (PPRTA) have been analyzed and simulated. The permitted grating period of PPRTA was compared with those of periodically poled lithium niobate (PPLN) and periodically poled potassium titanyl phosphate (PPKTP).
The sensing properties with strain and temperature of tapered FBG had been researched both theoretically and experimentally. Based on tapered FBG and thin-wall strain cylinder structure, a novel temperature-independent high pressure sensor was fabricated and investigated. The tapered FBG performed as a chirped grating, whose bandwidth and reflection power broadened and increased when the pressure...
Flexible optical channel data unit (ODUflex) is a new technique in the optical transport network (OTN) used to replace virtual concatenation (VCAT). For packet clients, it will be advantageous while ODUflex has the capability of hitless resizing like link capacity adjustment scheme (LCAS). A novel scheme is proposed in the paper for this purpose. The proposed scheme designs the new overhead (OH) and...
The beam propagation factor and kurtosis parameter of broadband Gaussian shell-model beams propagating in free space are studied numerically based on the intensity moments. The effects of spectral bandwidth and spatial correlation length on these two parameters are analyzed. The beam propagation factor or kurtosis parameter of beams with broader spectral bandwidth and smaller correlation length becomes...
A 10-Gb/s inductorless limiting amplifier for optic-fiber transmission system is designed and fabricated in a 0.18-μm CMOS technology. The whole circuit consists of an input buffer, three broadband gain stages, an output buffer for driving 50-Ω transmission lines and a DC offset cancellation circuit. By employing a third-order interleaving active feedback, the bandwidth of the proposed circuit can...
A 12-channal 120-Gb/s optical receiver front-end amplifier array has been designed in a 0.18-μm CMOS process. This front-end amplifier array incorporates transimpedance amplifiers (TIAs) and limiting amplifiers (LAs). A regulated cascode (RGC) input structure, active inductor peaking and feedback technique are exploited to enhance the bandwidth without deterioration of the other performances. And...
Micromachining techniques have been employed to manufacture microparticles bearing an engraved dot-type signature for biomolecular encoding. In addition, the code introduced on the particle face is a straightforward visible feature that is easily recognizable with the use of optical microscopy on the grounds of the CdSe Quantum dots (QDs) as fluorescent probes. In this paper, An integrated CMOS circuit...
The trends of LED replacing fluorescent and incandescent lamps for lighting are obvious in commercial applications. Then the visible light communications based on white light LED are promising communication technologies for high speed data transmissions. A bottleneck for this technology is the limited modulation bandwidth of LED. This paper reviews the recent improvements on bandwidth extension and...
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