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| 1 | An enhancer element in the EphA2 (Eck) gene sufficient for rhombomere - specific expression is activated by HOXA1 and HOXB1 homeobox proteins显示文摘 | CHEN J RULEY H E | 1998 | J Biol Chem1998，273，24： | 1 |
| 2 | Periodic structural defects in Bragg gratings and their application in multiwavelength devices显示文摘In this paper, we present the finding that periodic structural defects(PSDs) along a Bragg grating can shift the Bragg wavelength. This effect is theoretically analyzed and confirmed by numerical calculation. We find that the Bragg wavelength shift is determined by the defect size and the period of the defects. The Bragg wavelength can be well tuned by properly designing the PSDs, and this may provide an alternative method to fabricate grating-based multiwavelength devices, including optical filter arrays and laser arrays. In regards to wavelength precision, the proposed method has an advantage over the traditional methods, where the Bragg wavelengths are changed directly by changing the grating period. In addition, the proposed method can maintain grating strength when tuning the wavelength since only the period of defects is changed. This will be a benefit for devices such as arrays. | Rulei Xiao Yuechun Shi Renjia Guo Ting Chen Lijun Hao Xiangfei Chen | 2016 | Photonics Research2016，4，2： | 1 |
| 3 | Transient mode competition in directly modulated DFB semiconductor laser显示文摘A new effect of transient mode competition in directly modulated DFB laser based on equivalent phase-shift(EPS) technique is presented and studied. Since there are multi-order reflections in EPS structure and if the 0th order subgrating is properly designed, the transient lasing of 0th order will occur during the rising time of the injection current. As a result, transient mode competition between ?1st order(main mode) and 0th order will occur accordingly. This can consume redundant carrier and suppress the transient relaxation oscillation, which may be applied in some areas like on-off switching modulation of DFB semiconductor lasers. As an example, an equivalent ? phase shift(?-EPS) is carefully designed to realize the effect. In such a laser the 0th order wavelength is in the margin of the material gain region and the ?1st order wavelength is around the gain peak, while the stable single longitudinal mode(SLM) operation of the ?1st order is guaranteed. The simulation investigation is performed. Good results with suppressed relaxation oscillation and 1.25 Gb/s directly on-off modulation(32 d B extinction ratio) are demonstrated. We believe it provides a new kind of method for on-off switching with high extinction ratio and weak relaxation oscillation. | XIAO RuLei SHI YueChun ZHENG JiLin ZHANG YunShan ZHENG JunShou CHEN XiangFei | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，12： | 1 |
| 4 | Modulation bandwidth enhancement in monolithic integrated two-section DFB lasers based on the detuned loading effect显示文摘Modulation bandwidth enhancement in a directly modulated two-section distributed feedback(TS-DFB)laser based on a detuned loading effect is investigated and experimentally demonstrated.The results show that the 3-dB bandwidth of the TS-DFB laser is increased to 17.6 GHz and that chirp parameter can be reduced to 2.24.Compared to the absence of a detuned loading effect,there is a 4.6 GHz increase and a 2.45 reduction,respectively.After transmitting a 10 Gb/s non-return-to-zero(NRZ)signal through a 5-km fiber,the modulation eye diagram still achieves a large opening.Eight-channel laser arrays with precise wavelength spacing are fabricated.Each TS-DFB laser in the array has side mode suppression ratios(SMSR)>49.093 dB and the maximum wavelength residual<0.316 nm. | Yunshan Zhang Yifan Xu Shijian Guan Jilin Zheng Hongming Gu Lianyan Li Rulei Xiao Tao Fang Hui Zou Xiangfei Chen | 2023 | Journal of Semiconductors2023，44，11： | 0 |
| 5 | Increased N6-methyladenosine is related to the promotion of the methyltransferase METTL14 in ovarian aging显示文摘The ovary is a vital female reproductive organ that functions to produce oocyte gametes and cyclically expressed sex hormones to maintain reproductive capacity and hormone homeostasis.Ovarian aging,characterized by declines in follicle quantity and oocyte quality,leads to premature ovarian failure,premature ovarian insufficiency,or diminished ovarian reserve,thus contributing to female infertility.Distinct gene-expression signatures from RNA transcriptional level and post-transcriptional regulation are relative to oocyte quality and reproductive age. | Chunfeng Qian Zhenxing Liu Yonghong Qian Jie Ding Rulei Chen Han Su Minghong Shen Hong Li Boxian Huang | 2024 | Genes & Diseases2024，11，3： | 0 |
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