Special Glass Fiber and Device Engineering Technology Research

Guangzhou, China

Special Glass Fiber and Device Engineering Technology Research

Guangzhou, China
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Mo S.,South China University of Technology | Li Z.,South China University of Technology | Huang X.,South China University of Technology | Xu S.,South China University of Technology | And 13 more authors.
Laser Physics Letters | Year: 2014

We proposed a short-linear-cavity fiber laser with a virtual-folded-ring configuration, which combines the advantages of ring lasers and short-linear-cavity lasers. An all-fiber quarter-wave plate was used inside the cavity to introduce polarization retardation. By retarding the polarization of the travelling waves, the spatial-hole-burning effect was weakened and the efficient cavity length was extended to nearly twice its physical length. As a result, a single-frequency laser output with a linewidth of less than 820 Hz was obtained from the free-running fiber laser. The relaxation oscillation frequency was observed to be around 280 kHz and the signal to noise ratio of the laser output was >72 dB. © 2014 Astro Ltd.


Zhang Z.,South China University of Technology | Gan J.,South China University of Technology | Gan J.,Special Glass Fiber and Device Engineering Technology Research | Yang T.,South China University of Technology | And 5 more authors.
Optics Letters | Year: 2015

A novel all-fiber mode-locked fiber laser based on microfiber polarizer is proposed and demonstrated. The microfiber polarizer is composed of two pieces of microfibers that are finely manipulated to be partly overlapped. Because of the asymmetric cross section, the microfiber polarizer shows a strong birefringence that ultimately induces a high polarization-selective feature. Compared with other polarizers, the microfiber polarizer owns the merits of simpler fabrication, lower cost, broader band, and more compact size. The polarization extinction ratio of the microfiber polarizer is 26 dB, and the stable pulse sequence with the duration of 2.9 ps is generated from this microfiber polarizer based all-fiber mode-locked laser. © 2015 Optical Society of America.


Zhang Z.,Luminescent | Fan W.,Luminescent | Gan J.,Luminescent | Gan J.,Special Glass Fiber and Device Engineering Technology Research | And 3 more authors.
Applied Physics Express | Year: 2013

A compact single-frequency microfiber laser was demonstrated in a single-knot Er3+/Yb3+ co-doped phosphate glass fiber ring with a diameter of 397.5 μm. The lasing wavelength is 1534.25nm and the side-mode suppression ratio (SMSR) is higher than 27 dB. The linewidth is measured to be about 5 kHz and the relative intensity noise (RIN) is around -110 dB/Hz at frequencies over 50 kHz. © 2013 The Japan Society of Applied Physics.


Ning Q.-Y.,South China Normal University | Liu H.,South China Normal University | Zheng X.-W.,South China Normal University | Yu W.,South China Normal University | And 8 more authors.
Optics Express | Year: 2014

The vector nature of multi-soliton dynamic patterns was investigated in a passively mode-locked figure-eight fiber laser based on the nonlinear amplifying loop mirror (NALM). By properly adjusting the cavity parameters such as the pump power level and intra-cavity polarization controllers (PCs), in addition to the fundamental vector soliton, various vector multi-soliton regimes were observed, such as the random static distribution of vector multiple solitons, vector soliton cluster, vector soliton flow, and the state of vector multiple solitons occupying the whole cavity. Both the polarization-locked vector solitons (PLVSs) and the polarizationrotating vector solitons (PRVSs) were observed for fundamental soliton and each type of multi-soliton patterns. The obtained results further reveal the fundamental physics of multi-soliton patterns and demonstrate that the figure-eight fiber lasers are indeed a good platform for investigating the vector nature of different soliton types. © 2014 Optical Society of America.


Yang C.,South China University of Technology | Xu S.,South China University of Technology | Yang Q.,South China University of Technology | Mo S.,South China University of Technology | And 8 more authors.
Optics Express | Year: 2014

A 1.03 W optical signal-to-noise ratio (OSNR) of > 70 dB single-frequency polarization-maintained master-oscillator power amplifier (PMMOPA) laser at 1083 nm was demonstrated. The seed laser of this laser system was a distributed Bragg reflector short cavity Yb-doped phosphate fiber oscillator. A one-stage core-pumped amplification configuration was employed, in which the typical gain is 9.7 dB and the optical-to-optical conversion efficiency is 68.7%. The estimated laser linewidth is less than 3.5 kHz, the measured polarization-extinction ratio is greater than 25 dB, and the obtained relative intensity noise of fiber laser for frequencies of over 2 MHz is less than -130 dB/Hz. © 2014 Optical Society of America.


Ma Z.,South China University of Technology | Ma Z.,Special Glass Fiber and Device Engineering Technology Research | Hu Z.,South China University of Technology | Zhang H.,South China University of Technology | And 10 more authors.
Journal of Materials Chemistry C | Year: 2016

Nanofibers are characterized with unique electronic, magnetic and optical properties, due to their extremely high aspect ratio and large specific surface area. Assembly of nanofibers with predesigned macro architectures is a key step toward practical applications. Herein, we demonstrate the scalable oriented assembly of nanofibers based on electrospinning, and explore their potential application in constructing optically anisotropic films. By the post soaking-and-drying approach, the nonwoven films assembled by oriented polymer nanofibers can be readily converted to flexible films with high transparency, which show optical transmission contrast exceeding 0.9 in the visible to near infrared region. The method for preparation of optically anisotropic films proposed here circumvents the sophisticated dye-doping and thermal drawing processes which are inevitable in conventional approaches. Considering the scalability potential of the electrospinning technique, the method demonstrated here is promising for industrial production of film polarizers. © The Royal Society of Chemistry 2016.


He X.,South China University of Technology | He X.,Special Glass Fiber and Device Engineering Technology Research | Luo A.,South China Normal University | Yang Q.,South China University of Technology | And 15 more authors.
Applied Physics Express | Year: 2013

We report on the generation of high-energy noiselike pulse in a passively mode-locked thulium-doped fiber ring laser based on the nonlinear polarization evolution technique. A newly developed heavily thulium-doped germanate glass fiber was used as the gain medium. By properly rotating the polarization controllers, the 17.3 nJ noiselike pulse with 60.2 nm spectral bandwidth was obtained at the fundamental pulse repetition frequency of 6.37 MHz. Correspondingly, the maximum average output power was 110mW. The direct output of high-energy noiselike pulse from the thulium-doped fiber laser provides a good candidate of pulse source for some important applications such as the supercontinuum generation at mid-infrared wavelength range and optical metrology. © 2013 The Japan Society of Applied Physics.


Feng Z.,South China University of Technology | Mo S.,South China University of Technology | Xu S.,South China University of Technology | Huang X.,South China University of Technology | And 8 more authors.
Applied Physics Express | Year: 2013

A compact 1064nm linearly polarized low-noise single-frequency fiber laser has been demonstrated. An over 200mW stable polarizationmaintaining (PM) single-longitudinal-mode laser was achieved from an 8-mm-long custom-built non-PM Yb3+-doped phosphate fiber. The linear polarization extinction ratio (LPER) is larger than 30 dB. The measured relative intensity noise (RIN) is less than -125 dB/Hz at frequencies over 700 kHz. The linewidth of the fiber laser is estimated to be less than 2 kHz. © 2013 The Japan Society of Applied Physics.


Mo S.,South China University of Technology | Feng Z.,South China University of Technology | Xu S.,South China University of Technology | Zhang W.,South China University of Technology | And 7 more authors.
IEEE Photonics Journal | Year: 2013

Narrow linewidth microwave signals generated from a heterodyne detection configuration of a dual-wavelength (DW) single-frequency highly Er 3+/Yb3+co-doped phosphate fiber laser is presented. The oscillating cavity of the fiber laser consists of a dualchannel narrow-band fiber-Bragg-grating (DC-NB-FBG), a 0.7-cm-long Er3+/Yb3+ co-doped phosphate fiber and a wideband FBG (WB-FBG). The wavelength selecting gratings are spatially separated to create partially separated resonant cavities. Highly Er3+/Yb3+ codoped phosphate fiber ensures that the mode competition is relatively weak under low pump power. DW single-frequency lasing with laser linewidths of < 3 kHz is achieved. A 12.014-GHz microwave signal with a 3-dB linewidth of < 3 kHz is obtained from the heterodyne detection of the DW fiber laser. 1© 2009-2012 IEEE.


Tang G.,South China University of Technology | Qian Q.,South China University of Technology | Qian Q.,Special Glass Fiber and Device Engineering Technology Research | Wen X.,South China University of Technology | And 7 more authors.
Journal of Alloys and Compounds | Year: 2015

For the first time to the best of our knowledge phosphate glass-clad optical fibers comprising tellurium (Te) semiconductor core have been fabricated using a molten core approach. The cores were found to be highly crystalline and phase-pure as evidenced by X-ray diffraction (XRD) and corroborated by Micro-Raman spectrum. Elemental analysis across the core/clad interface suggests that there is some diffusion of oxygen and phosphorus into the core region and, conversely, diffusion of Te into the cladding region. Unfortunately, the propagation loss of the Te core fibers was too high to measure due to the significant scattering from the grain boundaries, oxygen and phosphor precipitates. However, the larger Raman gain, infrared and terahertz transparency of tellurium over silicon and germanium should make these fibers of significant value for fiber-based mid- to long-wave infrared, terahertz waveguides and Raman-shifted infrared light sources. © 2015 Elsevier B.V. All rights reserved.

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