- 标题
- 摘要
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Microwave behavior of a monolithic dual-wavelength DFB laser based on current injection model
摘要： A driving current based model describing the optical heterodyne output of a monolithic dual-wavelength DFB laser is established. The linear relationship between the driving current and the laser output wavelength was applied to obtain the simple equation for this purpose. Actual measured data from the real devices were used for the initial parameter extraction and the practical model can then be built. By using this model, the influence of different laser parameters towards the radio frequency signal generation and different current configuration on the output characteristic can be demonstrated. This can facilitate the future design of such integrated photonic devices.
关键词： Dual-wavelength,Distributed feedback (DFB) laser,Monolithic
更新于2025-09-23 15:21:01
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Spectroscopic and laser properties of erbium and ytterbium co-doped photo-thermo-refractive glass
摘要： Spectral-luminescent characteristics of erbium ions in photo-thermo-refractive (PTR) glasses doped with different concentrations of ytterbium and erbium oxides were investigated in this work. X-ray diffraction pattern of studied glasses was carried out. Judd-Ofelt parameters of intensity Ωt were obtained and used for deriving emission cross-sections and radiative lifetimes. It was found that the peak emission cross-sections values at a wavelength of 1.53 μm obtained from F-L and McCumber methods are 0.59 × 10?20 cm2 and 0.60 × 10?20 cm2, respectively, which are very similar and compared with those of silicate glasses. A quite high value of quantum yield at the wavelength of 1.53 μm for the sample with 0.1 mol% Er2O3 co-doped with ytterbium oxide has been investigated. Energy transfer efficiency from ytterbium ions to erbium ones was found to be 80% and 86% for erbium- and 1 mol% and 2 mol% Yb2O3-co-doped PTR glass, respectively. Laser properties of 2Yb-01Er PTR glass were carried out. The gain spectrum starts to be positive when the population inversion parameter gets to 0.5. Laser action was demonstrated at room temperature. It was found that the round-trip losses of the Er/Yb-PTR element are 0.28%.
关键词： Ytterbium,DFB laser,PTR glass,Erbium,XRD,Judd-ofelt
更新于2025-09-23 15:19:57
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - New Insights on Quantum Random Number Generation (QRNG) by Phase Diffusion
摘要： We present a parametric study of QRNG harnessing phase diffusion in gain-switched DFB laser diode. Our ?ndings give new insights into the process, its limitations regarding maximum raw data rate, and advantage of pulsed regime. ? 2019 The Author(s)
关键词： quantum random number generation,pulsed regime,phase diffusion,DFB laser diode
更新于2025-09-16 10:30:52
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Experimental Demonstration of Single Sideband Modulation Utilizing Monolithic Integrated Injection Locked DFB Laser
摘要： Single sideband (SSB) modulation based on a monolithic integrated optically injection-locked (MOIL) DFB laser is demonstrated experimentally. To our knowledge, this is the first time to realize SSB modulation utilizing a MOIL DFB laser. Tunable SSB signals with large lower-to-upper sideband power ratios are achieved by changing the bias currents of the MOIL DFB laser. The largest lower-to-upper sideband power ratio is measured to be 24.4 dB, which is very useful for improving the transmission performance of a radio-over-fiber link. Due to the generated SSB modulation, the fiber transmission response is flattened significantly and a signal of 25 GHz is transmitted through 85-km fiber without being affected by the fiber chromatic dispersion. 20 MSymbol/s 32-QAM signals with subcarriers of 21 GHz, 23 GHz and 25 GHz are also transmitted by the proposed SSB modulation link, and both the error vector magnitude (EVM) and the bit error rate (BER) of the link are improved distinctly. The proposed method can effectively suppress the fiber chromatic dispersion.
关键词： optical photonic integration,Single sideband modulation (SSB),injection-locked DFB laser,fiber chromatic dispersion
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - SSB Modulation With Optimum Optical Carrier to Sideband Ratio Based on Polarization modulated Optical Signal Injected Into DFB Laser
摘要： A novel approach to perform a single sideband (SSB) modulation signal with optimum carrier to sideband ratio (OCSR) of 0 dB based on polarization modulated optical signal injected into DFB laser is proposed and experimentally demonstrated. When the polarization modulated optical signal is injected into DFB laser, due to the frequency selective gain feature of optical injected DFB laser, one sideband is amplified while the optical carrier and the other sideband are not changed. Therefore, the SSB signal is obtained. Adjusting polarization control (PC) to change the OCSR and obtain the SSB modulation with OCSR 0 dB and the amplitude difference of 44.87 dB.
关键词： DFB laser,Optical signal injected,Polarization modulated
更新于2025-09-16 10:30:52