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Photonics Research

Photonics Research

| A joint OSA/Chinese Laser Press publication

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Accepted papers to appear in an upcoming issue

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Articles 1 to 3 of 3

September


Efficiency improvement of dual-wavelength mode-locked laser based on compactly combined dual gain media and effect of spatial hole burning

  • Yung-Fu Chen, Yu-Jen Huang, Y. S. Tzeng, and H. H. Cho
  • received 07/04/2014; accepted 09/10/2014; posted 09/15/2014; Doc. ID 216393
  • [full text: PDF (565) KB)]
  • Abstract: A high-efficiency dual-wavelength self-mode-locked laser at 1.06 μm based on a physically combined Nd:YVO4/Nd:LuVO4 composite gain medium is reported. Under an incident pump power of 4.95 W, this picosecond laser efficiently emits the total output power of 1 W with the optical conversion efficiency of up to 20% and the shortest pulse width of 19 ps at the repetition rate of 3.88 GHz. The effect of spatial hole burning is experimentally and theoretically explored to manifest that not only the pulse duration would monotonically decrease, but also the temporal behavior would gradually display a narrow-peak-on-a-pedestal shape when the separation between the input end mirror and the gain medium is continuously reduced to increase the number of longitudinal lasing modes at 1064 and 1065 nm.

Keywords (OCIS):

  • (140.3480) Lasers and laser optics : Lasers, diode-pumped
  • (140.3530) Lasers and laser optics : Lasers, neodymium
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (140.4050) Lasers and laser optics : Mode-locked lasers

August


Wireless Data Transmission using Visual Codes

  • Thilo Fath, Falk Schubert, and Harald Haas
  • received 05/14/2014; accepted 08/23/2014; posted 08/25/2014; Doc. ID 211977
  • [full text: PDF (3311) KB)]
  • Abstract: In this paper, a new approach for wireless data transmission within an aircraft cabin is presented. The proposed application enables the transmission of data to a passenger’s user device. As wireless in-flight applications are subject to strict frequency and electromagnetic compatibility regulations, the data is transferred by optical wireless transmission, specifically by 2-dimensional visual codes. To this end, black-and-white or coloured visual code sequences are displayed on the in-flight entertainment (IFE) screen. These visual codes are captured by the built-in camera of the passenger’s mobile device and are decoded to reconstruct the transmitted data. In order to compensate for frame losses caused by effects like occlusion and motion blur, a temporal forward error correction (FEC) coding scheme is applied. Transmission experiments within an Airbus A330 cabin mock-up demonstrate the functionality of the implemented system under realistic conditions such as ambient illumination and geometric configuration. Representative user devices are used for evaluation, specifically a low-cost and a high-end smartphone are employed as receivers. Performance evaluations show that the proposed transmission system achieves data rates of up to 120 kbit/s per individual passenger seat with these user devices. As the user device has no physical connection to the sensitive on-board system, the proposed transmission system provides an intrinsic safety feature.

Keywords (OCIS):

  • (110.2970) Imaging systems : Image detection systems
  • (200.4650) Optics in computing : Optical interconnects
  • (230.0230) Optical devices : Optical devices
  • (200.2605) Optics in computing : Free-space optical communication
  • (110.4155) Imaging systems : Multiframe image processing
  • (330.4595) Vision, color, and visual optics : Optical effects on vision

Enhanced mid-to-near-infrared second harmonic generation in silicon plasmonic microring resonators with low pump power

  • Xinliang Zhang, Zhang Jihua, and Eric Cassan
  • received 07/11/2014; accepted 08/19/2014; posted 08/21/2014; Doc. ID 216652
  • [full text: PDF (749) KB)]
  • Abstract: We propose an efficient and low-power second harmonic generation (SHG) process in a silicon-compatible hybrid plasmonic microring resonator. By making the microring resonator doubly-resonant at the fundamental wavelength of 3.1μm and second harmonic wavelength of 1.55μm, the SHG efficiency is enhanced by almost two orders of magnitude when compared to the previous result induced in a straight plasmonic waveguide. A SHG efficiency of 13.71% is predicted for a low pump power of 20 mW in a ring with radius of 2.325μm.This device provides a potential route for realizing efficient frequency conversion between mid-infrared and near-infrared wavebands on a chip.

Keywords (OCIS):

  • (190.2620) Nonlinear optics : Harmonic generation and mixing
  • (230.5750) Optical devices : Resonators
  • (250.5403) Optoelectronics : Plasmonics
  • (250.4390) Optoelectronics : Nonlinear optics, integrated optics

Articles 1 to 3 of 3





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