将钛宝石激光器产生的飞秒激光脉冲泵浦实验室自制的高非线性双折射光子晶体光纤,脉冲的中心波长为820 nm,位于光子晶体光纤的接近于零色散的反常色散区.实验结果表明：随着泵浦功率的增加,一阶孤子的中心波长发生了红移,同时产生的色散波的中心波长则发生蓝移进入可见光区.当泵浦功率达到0.45 W时,色散波与残余泵浦的输出功率比为42.67,色散波的带宽达到81 nm,而处于近红外波段的红移孤子带宽可达231 nm.利用高非线性光子晶体光纤产生近红外波段宽带孤子和可见区高效色敬波的实验对飞秒激光频率转换和光谱展宽具有很好的借鉴意义.

分别用980 nm和830 nm的半导体激光器作为泵浦源激发铋/铒共掺光纤，采用前向和背向泵浦方式分析放大的自发辐射谱特性.实验结果表明：随着泵浦功率的增大，荧光强度显著增强.利用980 nm半导体激光器，采用前向泵浦方式可激发以1 142 nm和1 536 nm为中心的两个辐射带，以1 142 nm为最高辐射峰的3 dB带宽是141 nm，以1 536 nm为最高辐射峰的3 dB带宽是29 nm.利用830 nm半导体激光器，采用前向泵浦方式可激发以1 421 nm为中心的荧光谱，3 dB带宽是447 nm.980 nm和830 nm激光器分别前向泵浦铋/铒共掺光纤时，随着光纤长度的增加，荧光先增强后减弱；分别背向泵浦铋/铒共掺光纤时，随着光纤长度的增加，荧光强度先逐渐增强后保持稳定.在25~80℃的温度范围内，铋/铒共掺光纤的荧光强度几乎不受温度的影响.使用980 nm和830 nm泵浦源同时激发铋/铒共掺光纤，结果表明铋/铒共掺光纤的发光中心具有相对独立性，发光范围存在部分重叠.

To evaluate the light field display system with a liquid crystal display (LCD) and a holographic functional screen (HFS), the voxel theory based on the ray tracing is used. By analyzing the voxels defined by the cases of corresponding pixels overlapping completely and partially in the image space, the resolution characteristics of the system are discussed. The theoretical model is verified in the reconstruction experiment of a resolution target and compared with the calculation result of the presented system. Finally, we give an optimization method for the display image quality.

We propose a novel scheme for synchronous optical sampling based on multicast parametric process. The linearly chirped and time-broadened pulses are utilized to replace the traditional mode-locked sampling pulses. An optical sampling rate of 80 Gbit/s is realized by using only one sampling source with repetition rate of 10 GHz.

A new receiver is proposed, which uses the fiber optical parametric amplifier (FOPA) in optical code division multiple access (OCDMA) over free space optic (FSO) communication system. The noise tolerance as the performance index in this receiver is derived. The receiver can not only improve the noise tolerance but also change the pump data conveniently for adapting to the length variation of the coding sequence under a complex and fast-changing weather condition. The influence of different factors on the noise tolerance is analyzed, and a significant improvement of about 18.77 dB for the noise tolerance can be achieved when the pump power and the length of coding sequence are 5 W and 256, respectively.

We investigate the spectra of the gain and pump-to-signal relative intensity noise (RIN) transfer in silicon optical parametric amplifier (SOPA) with Raman effect, and draw a conclusion that Raman effect makes the spectra narrower from 260 nm to 180 nm. A maximum gain also appears at 1622 nm. Moreover, the effects of the related parameters in SOPA on the gain and the pump-to-signal RIN transfer characteristics are also discussed. The high gain (16 dB) and low pump-to-signal RIN transfer (7 dB) can be obtained by using the appropriate parameters of pump and silicon waveguide.

We theoretically and experimentally show the impact of the ratio between the signal and idler generated from the PIA part on the gain characteristics in the continuous wave (CW) pump non-degenerate cascaded phase-sensitive fiber optical parametric amplifier (PS-FOPA). The results show that the length of highly nonlinear fiber (HNLF) used for generating the idler can cause the variation of power ratio between the idler and signal, which significantly affects the gain characteristics of the PS-FOPA under the small signal gain condition. To obtain high gain, it is better to choose long HNLF to generate idler. In our experiment, 5.5 dB gain and 18 nm bandwidth (on/off gain>10 dBm) in PS-FOPA can be achieved when 300 m-long HNLF instead of 200 m-long HNLF is used in PIA.