Search results for: Shouyu Luo

Items from 1 to 15 out of 15 results

article

Group Velocity Manipulation of 10 Gb/s Signal by Mutually-Modulated Cross-Gain Modulation in Semiconductor Optical Amplifiers

Fangying Tao, Li Zhan, Xuelin Yang, Zhaochang Gu, more

IEEE Photonics Technology Letters > 2014 > 26 > 6 > 606 - 608

We propose and experimentally demonstrate the propagation of slow/fast-light via mutually modulated cross-gain modulation in a semiconductor optical amplifier (SOA). Owing to very short recovery time in SOAs, the group velocity of 10-Gb/s signal light can be controlled by manipulating the saturating light. The maximum controlled time of one pulse period has been observed, whereas the signal light...

article

High-energy all-fiber soliton laser employing a chirped fiber Bragg grating

Junsong Peng, Li Zhan, Zhaochang Gu, Shouyu Luo

Optics Communications > 2013 > 294 > Complete > 246-249

We present an all-fiber self-starting high-energy soliton laser based on a chirped fiber Bragg grating (CFBG). The oscillator is mode-locked by nonlinear polarization rotation (NPR). As the net dispersion is greatly increased by the CFBG, the pulse energy can be increased correspondingly. The single pulse energy is 4.8nJ, and the pulse duration is 4.4ps with a repetition rate of 16.6MHz.

article

Passive Harmonic Mode-Locking of Dissipative Solitons in a Normal-Dispersion Er-Doped Fiber Laser

Junsong Peng, Li Zhan, Shouyu Luo, Qishun Shen

Journal of Lightwave Technology > 2013 > 31 > 16 > 3009 - 3014

Tunable harmonic mode-locking of (HML) one kind of dissipative solitons (DSs) has been experimentally demonstrated in an Er-doped fiber (EDF) laser for the first time. The laser is mode-locked by nonlinear polarization rotation. The repetition rate can be tuned from the 2nd to 10th-order HML. A high repetition rate of 232 MHz (10th- order HML) has been observed in this laser, and the pulse duration...

article

Pulse Energy Scaling by Optimizing Cavity Management in Low Repetition Rate Erbium-Doped Fiber Femtosecond Lasers

Junsong Peng, Li Zhan, Shouyu Luo, Qishun Shen

IEEE Journal of Quantum Electronics > 2013 > 49 > 4 > 408 - 412

We experimentally demonstrate direct generation of 51 nJ, 284-fs ultrashort pulses in an all-fiber cavity-optimized erbium-doped laser with a low repetition rate of 2.68 MHz. The conversion efficiency of the laser is about 10%. The laser is mode-locked by nonlinear polarization rotation. Such high energy and ultrashort duration benefits from using large output ratio (90%), elongating the cavity length,...

article

Generation of Soliton Molecules in a Normal-Dispersion Fiber Laser

Junsong Peng, Li Zhan, Shouyu Luo, Qishun S. Shen

IEEE Photonics Technology Letters > 2013 > 25 > 10 > 948 - 951

Though normal-dispersion mode-locked fiber lasers generally work on a single-pulse regime due to the large chirp of the pulses, we observe bound states of one kind of dissipative solitons in the laser. The separation between the bounded pulses in such soliton molecules increases with the pump power, and also varies with the settings of polarization controllers, which is consistent with other kinds...

article

Direct generation of 128-fs Gaussian pulses from a compensation-free fiber laser using dual mode-locking mechanisms

Junsong Peng, Li Zhan, Zhaochang Gu, Kai Qian, more

Optics Communications > 2012 > 285 > 5 > 731-733

We have experimentally demonstrated the direct generation of 128-fs pulses in an all-anomalous-dispersion all-fiber mode-locked laser. The laser is free of dispersion compensation in the cavity based on standard single mode fiber (SMF). The time-bandwidth product is 0.536. The laser is achieved by using two mode-lockers, one is nonlinear polarization rotation (NPR), and the other is nonlinear amplifying...

article

Modulation Instability in Dissipative Soliton Fiber Lasers and Its Application on Cavity Net Dispersion Measurement

Junsong Peng, Li Zhan, Zhaochang Gu, Jinmei Liu, more

Journal of Lightwave Technology > 2012 > 30 > 16 > 2707 - 2712

Modulation instability (MI) in passively mode-locked dissipative solitons lasers has been studied. The factors that affect MI, including the intensity of the nonlinear wave and the linear phase delay of the cavity, have been experimentally studied. It's found that MI induces sidebands in the spectrum of dissipative solitons. The sidebands can cause the pedestal on the pulse in time domain and thus...

article

Direct Generation of 4.6-nJ 78.9-fs Dissipative Solitons in an All-Fiber Net-Normal-Dispersion Er-Doped Laser

Junsong Peng, Li Zhan, Zhaochang Gu, Kai Qian, more

IEEE Photonics Technology Letters > 2012 > 24 > 2 > 98 - 100

We have demonstrated the direct generation of 4.6-nJ 78.9-fs ultrashort pulses with 58 kW peak power in an all-fiber net-normal-dispersion oscillator. Such high peak power is a record in an all-fiber oscillator and is comparable to chirped-pulse amplification systems. The corresponding spectrum has steep spectral edges, which is the typical shape of dissipative solitons (DS). Also, we find that the...

article

Demonstration of color filters for OLED display based on extraordinary optical transmission through periodic hole array on metallic film

Yibo Qiu, Li Zhan, Xiao Hu, Shouyu Luo, more

Displays > 2011 > 32 > 5 > 308-312

By optimizing critical parameters including period, thickness, hole shape and diameter, a tri-color filter based on extraordinary optical transmission through periodic hole array on metallic film is designed for OLED display, which shows high purity, narrow bandwidth and large resonant peak in simulation, and experimentally study. Also, its practicability gets confirmed by further verifications in...

article

Controlling of symmetric and asymmetric mode coupling in long-period fiber gratings singe-side induced by long-pulse CO2 laser

Xuesong Liu, Ming Yan, Li Zhan, Shouyu Luo, more

Optics Communications > 2011 > 284 > 5 > 1232-1237

We report a simple fabricating approach to control the mode couplings in long-period fiber gratings (LPFGs) through side exposing fiber to long-pulse-10.6-μm laser from a cheap, internally modulated CO ₂ tube. By tuning focused-spot size on fibers, not only circularly symmetric mode coupling but also asymmetric mode couplings can be effectively achieved. Simulation of mode profiles in grating...

chapter

Slow/fast light in erbium-doped fibers based on cross gain modulation

Li Zhan, Kai Qian, Liang Zhang, Fangying Tao, more

10th International Conference on Optical Communications and Networks (ICOCN 2011) > 1 - 2

10th International Conference on Optical Communications and Networks (ICOCN 2011)

We proposed and demonstrated the propagation of slow/fast light in erbium-doped fiber through gain cross modulation. We observed the ultraslow light with a group velocity of 6.1×10⁻³ c and the superluminal propagation with a negative group velocity of −5.1×10⁻⁴ c.

article

Step-changed period chirped long-period fiber gratings fabricated by CO2 laser

Ming Yan, Shouyu Luo, Li Zhan, Yilei Wang, more

Optics Communications > 2008 > 281 > 10 > 2784-2788

A CO ₂ laser and point-by-point method are used for fabricating step-changed period chirped long-period fiber gratings (LPFG). Several types of period chirped LPFGs have been demonstrated, such as, linearly chirp, peak-shape chirp, and cascaded linearly chirp. Unlike uniform LPFGs, the spectrum change such as multiple attenuation peaks, broader spectrum can be seen in these chirp gratings,...

article

High-Power Low-Noise Fiber Brillouin Amplifier for Tunable Slow-Light Delay Buffer

Liang Xing, Li Zhan, Shouyu Luo, Yuxing Xia

IEEE Journal of Quantum Electronics > 2008 > 44 > 12 > 1133 - 1138

<para> A high-power low-noise fiber Brillouin amplifier (FBA) has been demonstrated for slow-light delay buffer. Its features including gain, gain saturation, and noise figure (NF), have been characterized. Among them, the gain saturation is highlighted because it is a fundamental limitation for FBA-based slow-light buffer. It is testified that the gain saturation is more easily achieved for...

article

Multiple pulses with broadband spectrum generation in passively mode-locked fiber ring laser incorporating a highly nonlinear fiber

Zuxing Zhang, Li Zhan, Shouyu Luo, Yuxing Xia

Optics Communications > 2006 > 266 > 1 > 164-168

Multiple pulses with broadband spectrum generation are experimentally obtained in passively mode-locked erbium-doped fiber ring lasers based on nonlinear polarization rotation, which is achieved by incorporating a length of highly nonlinear dispersion-shifted fiber in the laser cavity. The temporal and spectral dynamic behaviors of multipulse bunching states are demonstrated. The maximum spectral...

article

Identification of the alignment of azobenzene molecules induced by all-optical poling in polymer film

Xiaoxia Zhong, Xiuqin Yu, Qu Li, Shouyu Luo, more

Optics Communications > 2001 > 190 > 1-6 > 333-337

The alignment of azobenzene molecules in DR19-PUI film induced by all-optical poling is identified. When the writing beams of frequencies ω and 2ω are both linearly polarized with their polarization directions parallel to each other, azobenzene molecules tend to reorient to perpendicular direction (i.e. direction perpendicular to the polarization of writing beams). At the end of the writing process...

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