共查询到19条相似文献,搜索用时 859 毫秒
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偏振控制C波段波长可调谐掺铒光纤激光器 总被引:1,自引:1,他引:1
报道了一种结构简单的波长可调谐掺铒光纤激光器。该光纤激光器由增益平坦型掺铒光纤放大器(EDFA)、偏振相关光隔离器、光纤偏振控制器及输出耦合器组成。利用光纤偏振控制器和偏振相关光隔离器作为波长调谐器件,实现了光纤激光器的波长可调谐输出及双波长输出。利用琼斯矩阵理论分析了光纤激光器腔内不同波长的损耗与偏振控制器状态的关系,指出通过调节光纤偏振控制器,光纤激光器可以实现波长可调谐输出,同时阐述了光纤激光器双波长输出的机制。实验上获得了中心波长在1542~1564nm连续可调,平均功率大于2.6mW,边模抑制比大于35dB的连续激光输出。同时获得了波长为1549nm和1564nm的双波长连续激光输出。 相似文献
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本文提出了一种利用两个F -P半导体激光器双向注入锁定产生波长可调谐光脉冲的实验系统。该实验系统只需调节可调谐滤波器就可以方便地选择不同波长的单纵模光脉冲,在2 5nm的波长调谐范围内边模抑制比(SMSR)为2 6dB ,其中18nm的波长范围内高于3 1dB。 相似文献
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陈长水 《激光与光电子学进展》2001,(9):7
采用腔内分束调谐系统在腔内分别调谐控制两路基波光束,获得分别独立调谐的双波长双脉冲基波光束输出;接着利用一块BBO谐波晶体腔内同时倍频(900 nm附近)双波长基波光脉冲,获得450 nm附近可调谐输出的双波长双脉冲二次谐波光脉冲;再在腔内插入另一块三次谐波BBO晶体,经调整后,获得300 nm附近可调谐输出的双波长双脉冲三次谐波光脉冲;利用一块四次谐波BBO晶体腔外倍频450 nm附近输出的双波长双脉冲激光束,经腔外合束系统合束,获得225 nm附近双波长双脉冲激光束;利用获得的双波长双脉冲Cr∶LiSAF二次、三次、四次谐波激光束实际测量了空气中NO、NO2、SO2气体的含量,获得了很高的测量精度.(OB2) 相似文献
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为实现单光束、双波长、双脉冲Cr:LiSAF调Q激光输出,实验中创造性地采用高压方波驱动电光Q开关实现了双波长、双脉冲的Cr:LiSAF可调谐激光输出。获得了波长分别为890nm与900nm,脉冲能量分别为31mj与38mj,脉冲宽度分别为30ns和27ns,脉冲间隔82μs的单光束、双波长、双脉冲Cr:LiSAF调Q激光输出,双脉冲的不同轴度不大于0.15mrad。为差分吸收激光雷达系统所需单光束、双波长、双脉冲激光器的进一步研制奠定了良好的理论与实验基础。 相似文献
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《Photonics Technology Letters, IEEE》1999,11(1):15-17
The design and operation of dual-wavelength InGaAs-GaAs asymmetric cladding ridge waveguide distributed Bragg reflector (DBR) lasers are reported. DBR lasers with mode pair separations of 4.1, 8.4, and 16.9 nm exhibit stable, simultaneous, dual-wavelength operation in current ranges of 40-52 mA, 32-42 mA, and 28-35 mA, respectively. Within the stated current ranges, all lasing modes exhibit at least 20-dB sidemode suppression, and approximately 30-dB sidemode suppression under optimum operating conditions 相似文献
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Xiaohui Fang D.N. Wang 《Photonics Technology Letters, IEEE》2003,15(6):855-857
A mutual pulse injection-seeding scheme is developed to produce wavelength-tunable optical short pulses by the use of two Fabry-Perot laser diodes, of which one is gain-switched and the other is dc biased. Wavelength tuning of the optical pulses is achieved by simply adjusting a tunable optical filter while maintaining a constant repetition frequency of 3.0 GHz. The sidemode suppression ratio obtained is more than 30 dB over the wavelength-tuning range of 19 nm. The system is simple and robust. 相似文献
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The sidemode suppression ratio of self-seeded, gain-switched optical pulses is shown to be a vital parameter in determining the usefulness of these pulses in wavelength-division multiplexed communications systems. Experiments carried out on a two-channel wavelength multiplexed setup using tunable self-seeded gain-switched pulse sources at 10 GHz, have demonstrated the cross-channel interference effects that may be encountered if the sidemode suppression ratio of one of the sources becomes degraded. The sidemode suppression ratio of self-seeded, gainswitched optical pulses is shown to be a vital parameter in determining the usefulness of these pulses in wavelength-division multiplexed communications systems. Experiments carried out on a two-channel wavelength multiplexed setup using tunable self-seeded gain-switched pulse sources at 10 GHz, have demonstrated the cross-channel interference effects that may be encountered if the sidemode suppression ratio of one of the sources becomes degraded 相似文献
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A gain-switched Fabry-Perot laser diode at 1.3 μm was self-seeded at different electrical bias and optical feedback rates. With a strong feedback, a comparatively large tuning range and a high sidemode suppression ratio were obtained but multimode emission might occur around the center of the range. Similar phenomenon was observed at a weaker feedback when the electrical bias was sufficiently large. The degradation in tunability was attributed to a broadening of the optical pulses, resulting in temporal overlapping of different longitudinal modes. Our optimized feedback of 2.5% and 3.1 mA bias provided a tuning range of 23.5 nm with a sidemode suppression ratio >10 dB 相似文献
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Shenping Li Chan K.T. Liu Y. Zhang L. Bennion I. 《Photonics Technology Letters, IEEE》1998,10(12):1712-1714
A novel scheme for generating multiwavelength short pulses using fiber Bragg gratings (FBGs) was demonstrated. In this scheme the external cavity length for all wavelengths selected by the gratings is intrinsically identical and the FBGs can be cascaded into the external cavity. Simultaneous generation of 1-GHz dual-wavelength short pulses with a wavelength separation of 1.6 or 18 nm was demonstrated. A sidemode suppression ratio (SMSR) better than 30 or 25 dB was achieved at both wavelengths in the former and latter cases respectively. Three-wavelength 1-GHz ps pulses with a SMSR better than 25 dB at all three wavelengths were also successfully generated 相似文献
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A tunable dual-wavelength erbium-doped fiber ring laser using a self-seeded Fabry-Perot laser diode 总被引:1,自引:0,他引:1
Peng-Chun Peng Hong-Yih Tseng Sien Chi 《Photonics Technology Letters, IEEE》2003,15(5):661-663
A tunable dual-wavelength erbium-doped fiber ring laser using a self-seeded Fabry-Perot laser diode (FP-LD) is proposed and demonstrated. By adding an FP-LD incorporated with a tunable bandpass filter within the ring cavity, the fiber laser can lase two wavelengths simultaneously because of the self-seeded mechanism. This dual-wavelength output exhibits a good performance having the optical side-mode suppression ratio over 31 dB. The wavelength-tuning range of this tunable dual-wavelength fiber laser can be up to 9 nm. 相似文献
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《Electronics letters》2008,44(25):1464-1466
A polymer coupled-ring reflector is hybrid-integrated with a reflective semiconductor optical amplifier to realise a widely tunable laser. The tuning range is measured to be about 35 nm, maintaining a sidemode suppression ratio of about 32 dB. 相似文献
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ZHANG Ming-jiang WANG Yun-cai 《光电子快报》2006,2(4):246-248
Recently there is an increasing interest in generatingshort optical pulses with lowti ming jitter and tuneablemulti-wavelength due toitsi mportant applicationin op-tical ti me division multiplexed(OTDM),wavelength di-vision multiplexed(WDM)systems,and opt… 相似文献