共查询到20条相似文献,搜索用时 31 毫秒
1.
Kim I. Alferness R.C. Buhl L.L. Koren U. Miller B.I. Newkirk M.A. Young M.G. Koch T.L. Raybon G. Burrus C.A. 《Electronics letters》1993,29(8):664-666
A tuning range of 48 nm has been achieved with a tuning current of only 40 mA in a 1.55 mu m InGaAsP/InP multiquantum-well laser based on a grating-assisted vertical coupler intracavity filter. Using a combination of current and voltage tuning a 55 nm tuning range was demonstrated.<> 相似文献
2.
单脊条形可调谐电吸收调制DFB激光器 总被引:1,自引:1,他引:0
报道了一种波长可热调谐的电吸收调制分布反馈激光器(Electroabsorptionmodulateddistributedfeedbacklaser,EML)。在激光器条形的侧面淀积一薄膜加热器,EML实现了 2 2nm的连续调谐。在调谐范围内,激光器输出功率的变化小于 3dB。采用端面有效反射率方法和耦合波理论的计算表明:采用相调制方法,可实现调谐范围达3 2nm的EML。如果热调谐与相调谐方法结合,可在较宽范围内实现波长快速调谐的EML 相似文献
3.
The tuning characteristics of ridge waveguide DBR lasers have been measured under CW and pulsed grating currents. Under CW grating current injection, a maximum tuning range of 2.5 nm was measured. This tuning range was extended to almost 7 nm under pulsed conditions. The increase in the tuning range is explained by the absence of thermal tuning mechanisms for pulsed grating currents and the dominance of thermal tuning in the ridge waveguide structure at large CW grating currents is explicitly shown.<> 相似文献
4.
Tohmori Y. Yoshikuni Y. Ishii H. Kano F. Tamamura T. Kondo Y. 《Electronics letters》1993,29(4):352-354
A broad range tuning of over 100 nm in tunable DBR lasers with superstructure grating (SSG) is reported. The SSG reflectors for 100 nm were designed and patterned by electron beam lithography. 1.55 mu m DBR lasers with SSG reflector operate in a single mode with a tuning range of 83 nm under CW conditions. With inclusion of the multimode operating region, the tuning range becomes as wide as 103 nm.<> 相似文献
5.
A novel wavelength-tunable distributed amplification distributed feedback laser diode (TDA-DFB-LD) is proposed and fabricated. The proposed structure provides synchronous change between the longitudinal mode and the Bragg wavelength in tuning; thereby continuous wavelength tuning can be realized with single control-current. Moreover, extended tuning is also possible with two control-currents. A continuous tuning range of 2.9 nm and an extended discrete tuning range of 15 nm are experimentally obtained with a 1.55-μm TDA-DFB-LD 相似文献
6.
We describe frequency tuning and channel access characteristics of the new, widely-tunable, multi-quantum-well three-branch Y3-lasers. The Y3-lasers are tuned discretely with two independent current controls: coarse tuning (5.5 nm, 680 GHz tuning steps) selects the desired optical frequency range, fine tuning selects the desired frequency channel (0.4 nm, 50 GHz channel spacing). For example, we demonstrate access to 50 channels over the ~31 nm free spectral range of the Y3-laser; 36 contiguous channels are accessed using three independent current controls. The coarse/fine “digital” tuning makes Y3-lasers very useful for wavelength-division-multiplexed (WDM) multi-channel optical communication systems 相似文献
7.
A novel broadband tunable laser diode is presented. It is based on a codirectional coupling scheme which is predicted to yield tuning ranges larger than 50 nm. Only a single control current is required for tuning. Preliminary devices have been realised indicating a wavelength tuning over 30 nm.<> 相似文献
8.
S. Sakano A. Oka N. Chinone 《Photonics Technology Letters, IEEE》1991,3(10):866-868
A thin-active layer was inserted into the tuning regions of a wavelength-tunable three-electrode DBR (distributed Bragg reflector) laser. The gain of the thin-active layer compensates for the loss in adjacent passive guide layers, and improved the optical output power and spectral linewidth in tuning operations. The total tuning range was over 8 nm and the continuous tuning range was over 1 nm, with an output power increase of 30%.<> 相似文献
9.
Rigole P.-J. Nilsson S. Backbom L. Klinga T. Wallin J. Stalnacke B. Berglind E. Stoltz B. 《Photonics Technology Letters, IEEE》1995,7(7):697-699
A vertical grating assisted codirectional coupler laser with a super structure grating distributed Bragg reflector is demonstrated. A record stepwise tuning range of 114 nm was measured with good side-mode suppression. The tuning behavior of the device is investigated showing a potential of a tuning range exceeding 100 nm with complete wavelength coverage 相似文献
10.
A widely tunable erbium-doped fiber laser pumped at 532 nm 总被引:2,自引:0,他引:2
Chen C.Y. Choy M.M. Andrejco M.J. Saifi M.A. Lin C. 《Photonics Technology Letters, IEEE》1990,2(1):18-20
A tunable erbium-doped fiber laser with a very wide continuous-tuning range (1522-1567 nm) is discussed. The wide tuning range was achieved using an aluminum/erbium-doped fiber; the aluminum codoping is known to broaden the gain spectrum substantially. The tunable fiber laser has a ring laser configuration utilizing an inline tunable etalon as the tuning element. Continuous tuning over 45 nm in the spectral range of 1522-1567 nm was achieved with 80 nW of pumping at 532 nm, using the second harmonic of a Nd:YAG laser as the pump source 相似文献
11.
Todt R. Jacke T. Meyer R. Adler J. Laroy R. Morthier G. Amann M.-C. 《Photonics Technology Letters, IEEE》2005,17(12):2514-2516
Device and tuning characteristics of sampled grating tunable twin-guide laser diodes are presented. The vertically integrated, monolithic widely tunable laser requires only two tuning currents to fully cover a wavelength range of more than 40 nm by electrooptic tuning. Its tuning behavior is quasi-continuous with up to 8.2-nm broad continuous tuning regions. High sidemode suppression (SMSR /spl ges/ 35 dB) as well as large output power (P /spl ges/ 10 mW) are obtained over the wavelength range from 1520.5 to 1561.5 nm. 相似文献
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13.
Zhou Zhen Han Qin Du Yun Yang Xiaohong Wu Ronghan Huang Yongqing and Ren Xiaomin 《半导体学报》2005,26(6):1087-1093
A GaAs-based micro-opto-electro-mechanical-systems(MOEMS) tunable resonant cavity enhanced(RCE) photodetector with a continuous tuning range of 31nm under a 6V tuning voltage is demonstrated.The single cantilever beam structure is adopted for this MOEMS tunable RCE photodetector.The maximum and minimum peak quantum efficiency during the tuning are 36.9% and 30.8%,respectively.The maximum and minimum full-widthathalf-maximum (FWHM) are 20nm and 14nm,respectively.The dark current density is 7.46A/m2 without bias. 相似文献
14.
Brown D.H. Flynn M.B. O'Faolain L. Krauss T.F. 《Photonics Technology Letters, IEEE》2005,17(11):2262-2264
Edge-emitting coupled-cavity semiconductor lasers employing a deeply etched Bragg reflector at one facet have been realized. The sidemode suppression ratio (SMSR) and wavelength tuning were investigated as a function of low level current injection. A single-mode tuning range of 3 nm centered around 977 nm displaying an SMSR better than 20 dB was obtained for tuning currents in the milliampere range. 相似文献
15.
Wavelength tuning in distributed-feedback (DFB) lasers using quantum-well intermixing is analyzed. A 0.42-nm tuning range is obtained when the bandgap is blue-shifted by 5.9 nm, and this value agrees well with the experimental value of 0.36 nm. The limitation of the tuning range is also discussed, and is because of the increase in carrier density that raises the gain above the threshold after intermixing. The dependence of wavelength shift on bandgap blueshift is not affected by the details of the intermixing process. A maximum tuning range of 3.5 nm is predicted, demonstrating that after device fabrication intermixing process can be used to adjust DFB lasers operating wavelengths to match the predefined wavelength channels of wavelength-division-multiplexing system 相似文献
16.
Shubochkin R.L. Kozlov V.A. Carter A.L.G. Morse T.F. 《Photonics Technology Letters, IEEE》1998,10(7):944-945
We demonstrate a tunable thulium-doped fiber ring laser wherein a single fused coupler acts simultaneously as the wavelength-division multiplexing for pump radiation, a lasing wavelength selective element, and output mirror. Temperature tuning of up to 2 nm/°C over a range of 40 nm and polarization tuning of over 100 nm within the spectral range from 1810 to 1930 nm have been obtained 相似文献
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18.
C.S. Goh M.R. Mokhtar S.A. Butler S.Y. Set K. Kikuchi M. Ibsen 《Photonics Technology Letters, IEEE》2003,15(4):557-559
We demonstrate a silica-based tunable fiber Bragg grating filter with a wavelength tuning range over 90 nm. A bend-tuning technique in a simple tuning package is employed to obtain a wide wavelength tuning range from 1634 to 1544 nm, covering the entire L-band and a half of the C-band. The polarization-mode dispersion and polarization-dependent loss of the device show little variations over the whole operating region. 相似文献
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