Contents
2014
Volume: 2 Issue 6
6 Article(s)
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Microlasers
Optical mode study of III–V-nanowire-based nanophotonic crystals for an integrated infrared band microlaser
Zhen Lin, Michel Gendry, and and Xavier Letartre
In this paper, we study an original strategy to generate an infrared waveband microlaser by an integrated III–V-nanowire (NW)-based photonic array for on-chip interconnects. The optical modes of the III–V-NW-based photonic array are investigated for utilization as an all-in-one gain medium, waveguide, and cavity. AdequIn this paper, we study an original strategy to generate an infrared waveband microlaser by an integrated III–V-nanowire (NW)-based photonic array for on-chip interconnects. The optical modes of the III–V-NW-based photonic array are investigated for utilization as an all-in-one gain medium, waveguide, and cavity. Adequate designs of periodic arrays of InP NWs with different polarization TM and TE modes are studied by 3D electromagnetic simulation finite difference time domain to optimize the resonant active photonic crystal (hybrid Bloch modes) in the infrared band at 1.3 μm. According to our calculations, NWs larger than 0.2 μm in diameter are needed to conceive optic modes inside NW photonics in TM polarization. However, smaller NW photonics, such as 0.1 μm in diameter, can obtain only the TE mode inside the NWs. This phenomenon is theoretically illustrated by the dispersive curves of NW-based photonics. It aims at demonstrating that the slow velocity mode inside the NW photonics will cause amplification of lightwaves and generate microlasers in the infrared band at 1.3 μm. These studies are of prime importance for further microlaser integration to silicon-on-insulator (SOI) waveguides for on-chip optical interconnects..
Photonics Research
- Publication Date: Jan. 01, 1900
- Vol. 2, Issue 6, 182 (2014)
Mode-Locked Lasers
Effect of spatial hole burning on a dual-wavelength mode-locked laser based on compactly combined dual gain media
Y. J. Huang, Y. S. Tzeng, H. H. Cho, and and Y. F. Chen
The effect of spatial hole burning (SHB) on dual-wavelength self-mode-locked lasers based on physically combined Nd:YVO4∕Nd:LuVO4 and Nd:YVO4∕Nd:KGW composite active medium is comparatively investigated. The length of the first Nd:YVO4 crystal is optimized to realize a highly compact and efficient TEM00-mode picosecondThe effect of spatial hole burning (SHB) on dual-wavelength self-mode-locked lasers based on physically combined Nd:YVO4∕Nd:LuVO4 and Nd:YVO4∕Nd:KGW composite active medium is comparatively investigated. The length of the first Nd:YVO4 crystal is optimized to realize a highly compact and efficient TEM00-mode picosecond laser at 1.06 μm with optical conversion efficiency greater than 20%. When the SHB effect is enhanced by decreasing the separation between the input end mirror and the composite gain medium, it is experimentally found that not only the pulse duration monotonically decreases, but also the temporal behavior gradually displays a narrow-peak-on-a-pedestal shape for the Nd:YVO4∕Nd:LuVO4 scheme, while the multipulse operation can be obtained for the Nd:YVO4∕Nd:KGW configuration. These phenomena are further explored by numerically simulating mode-locked pulses from the experimentally measured optical spectra..
Photonics Research
- Publication Date: Jan. 01, 1900
- Vol. 2, Issue 6, 161 (2014)
Bursts with shape-alterable pulses in a compact Tm-doped fiber laser with simultaneous active intracavity phase and intensity modulations
Xiong Wang, Pu Zhou, Xiaolin Wang, Hu Xiao, and and Zejin Liu
We present a compact Tm-doped fiber laser (TDFL) to generate pulse bursts at 1.92 μm based on phase and intensity modulations. A phase modulator (PM) and an intensity modulator (IM) were included in the linear TDFL cavity to perform the simultaneous active intracavity phase and intensity modulation. Stable pulse burstsWe present a compact Tm-doped fiber laser (TDFL) to generate pulse bursts at 1.92 μm based on phase and intensity modulations. A phase modulator (PM) and an intensity modulator (IM) were included in the linear TDFL cavity to perform the simultaneous active intracavity phase and intensity modulation. Stable pulse bursts have been achieved with tunable repetition rate in the range of 36–44 kHz (modulated by the PM) and duration of about 9.6 μs. The repetition rate of the individual pulse in a burst is about 9 MHz (modulated by the IM), and the pulse width is about 6 ns. By changing the IM signal’s repetition rate and duty cycle, different individual pulse shapes are obtained with pulse durations between 6 and 34 ns..
Photonics Research
- Publication Date: Jan. 01, 1900
- Vol. 2, Issue 6, 172 (2014)
Passive mode-locking in semiconductor lasers with saturable absorbers bandgap shifted through quantum well intermixing
Vincenzo Pusino, Michael J. Strain, and Marc Sorel
Passive mode-locking in semiconductor lasers in a Fabry–Perot configuration with a bandgap blueshift applied to the saturable absorber (SA) section has been experimentally characterized. For the first time a fully post-growth technique, quantum well intermixing, was adopted to modify the material bandgap in the SA sectPassive mode-locking in semiconductor lasers in a Fabry–Perot configuration with a bandgap blueshift applied to the saturable absorber (SA) section has been experimentally characterized. For the first time a fully post-growth technique, quantum well intermixing, was adopted to modify the material bandgap in the SA section. The measurements showed not only an expected narrowing of the pulse width but also a significant expansion of the range of bias conditions generating a stable train of optical pulses. Moreover, the pulses from lasers with bandgap shifted absorbers presented reduced chirp and increased peak power with respect to the nonshifted case..
Photonics Research
- Publication Date: Jan. 01, 1900
- Vol. 2, Issue 6, 186 (2014)
Nonlinear Optics
Modulation characteristics and microwave generation for AlGaInAs/InP microring lasers under four-wave mixing
Ling-Xiu Zou, Yong-Zhen Huang, Xiao-Meng Lv, Bo-Wen Liu, Heng Long, Yue-De Yang, Jin-Long Xiao, and and Yun Du
The dynamic characteristics are investigated for a microring laser with an external radius of 12 μm subject to external optical injection. Single-mode operation with a side mode suppression ratio of 33.4 dB is realized at a biasing current of 25 mA and a temperature of 290 K, and the corresponding small-signal modulatiThe dynamic characteristics are investigated for a microring laser with an external radius of 12 μm subject to external optical injection. Single-mode operation with a side mode suppression ratio of 33.4 dB is realized at a biasing current of 25 mA and a temperature of 290 K, and the corresponding small-signal modulation response is obtained with a resonance peak frequency of 7.5 GHz. Under the optical injection from a tunable laser, the improvements of the small-signal modulation response induced by four-wave mixing are observed for the microring laser, which shows an additional resonance peak around the frequency of the beat frequency between the lasing mode and the injecting light. Furthermore, optical generation of a microwave signal is realized by the light beating between the lasing mode and the injecting light measured by a high-speed photodetector and a spectrum analyzer..
Photonics Research
- Publication Date: Jan. 01, 1900
- Vol. 2, Issue 6, 177 (2014)
Spectroscopy
Blind spectral deconvolution algorithm for Raman spectrum with Poisson noise
Hai Liu, Zhaoli Zhang, Jianwen Sun, and and Sanya Liu
A blind deconvolution algorithm with modified Tikhonov regularization is introduced. To improve the spectral resolution, spectral structure information is incorporated into regularization by using the adaptive term to distinguish the spectral structure from other regions. The proposed algorithm can effectively suppressA blind deconvolution algorithm with modified Tikhonov regularization is introduced. To improve the spectral resolution, spectral structure information is incorporated into regularization by using the adaptive term to distinguish the spectral structure from other regions. The proposed algorithm can effectively suppress Poisson noise as well as preserve the spectral structure and detailed information. Moreover, it becomes more robust with the change of the regularization parameter. Comparative results on simulated and real degraded Raman spectra are reported. The recovered Raman spectra can easily extract the spectral features and interpret the unknown chemical mixture..
Photonics Research
- Publication Date: Jan. 01, 1900
- Vol. 2, Issue 6, 168 (2014)
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