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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

November


Quantum description and measurement for the single photons modulation

  • Jianyong Hu, Yan Liu, Lingling Liu, Guofeng Zhang, Suotang Jia, Bo Yu, and Liantuan Xiao
  • received 10/10/2014; accepted 11/26/2014; posted 12/01/2014; Doc. ID 224742
  • [full text: PDF (672) KB)]
  • Abstract: Single photons modulation has been proposed to overcome the defects of the low signal-to-noise ratio and slow process rate of the photon-counting. In this paper, we present the quantum theory of the single photons modulation, and then experimentally investigate the modulation spectroscopy from both the time domain and the frequency domain. It is found that the signal-to-noise ratio reached up to 150 in the MHz modulation bandwidth.

Keywords (OCIS):

  • (270.5290) Quantum optics : Photon statistics
  • (300.6380) Spectroscopy : Spectroscopy, modulation
  • (250.1345) Optoelectronics : Avalanche photodiodes (APDs)
  • (250.4110) Optoelectronics : Modulators

Incoherent Fourier ptychographic photography (FPP) using structured light

  • Guoan Zheng, Siyuan Dong, Pariksheet Nanda, and Kaikai Guo
  • received 08/29/2014; accepted 11/07/2014; posted 11/07/2014; Doc. ID 221809
  • [full text: PDF (2510) KB)]
  • Abstract: Controlling photographic illumination in a structured fashion is a common practice in computational photography and image-based rendering. Here we introduce an incoherent photographic imaging approach, termed Fourier ptychographic photography (FPP), which uses non-uniform structured light for super-resolution imaging. In this approach, frequency mixing between the object and the structured light shifts the high-frequency object information to the passband of the photographic lens. Therefore, the recorded intensity images contain object information that is beyond the cutoff frequency of the collection optics. Based on multiple images acquired under different structured light patterns, we used the Fourier ptychographic algorithm to recover the super-resolution object image and the unknown illumination pattern. We demonstrated the reported approach by imaging various objects, including a resolution target, a QR code, a dollar bill, an insect, and a leaf. The reported approach may find applications in photographic imaging settings, remote sensing, and imaging radar. It may also provide new insights for high-resolution imaging by shifting the focus from the collection optics to the generation of structured light.

Keywords (OCIS):

  • (100.3010) Image processing : Image reconstruction techniques
  • (100.6640) Image processing : Superresolution
  • (110.1758) Imaging systems : Computational imaging
  • (110.2945) Imaging systems : Illumination design
  • (110.4155) Imaging systems : Multiframe image processing

October


On-chip Mode Locked Laser Diode Structure using Multimode Interference Reflectors

  • Carlos Gordon, Guillermo Carpintero, Xaveer Leijtens, and Robinson Guzman
  • received 09/22/2014; accepted 10/25/2014; posted 10/28/2014; Doc. ID 223478
  • [full text: PDF (517) KB)]
  • Abstract: We report for the first time to our knowledge an On-chip Mode Locked Laser Diode (OCMLLD) that employs multimode interference reflectors (MIRs) to eliminate the need of facet mirrors to form the cavity. The result is an OCMLLD that does not require cleaved facets to operate, enabling us to locate this OCMLLD at any location within the photonic chip. This OCMLLD provides a simple source of optical pulses that can be inserted within a Photonic Integrated Circuit (PIC) chip for subsequent photonic signal processing operations within the chip (modulation, optical filtering, pulse rate multiplication...). The device was designed using standardized building blocks of a generic active/passive InP technology platform and fabricated in a Multi-Project Wafer (MPW) run and achieved mode locking operation at its fundamental frequency given the uncertainty at the design step of the optical length of these mirrors, critical to achieve colliding pulse mode locked operation.

Keywords (OCIS):

  • (130.3120) Integrated optics : Integrated optics devices
  • (140.4050) Lasers and laser optics : Mode-locked lasers
  • (250.5300) Optoelectronics : Photonic integrated circuits
  • (250.5960) Optoelectronics : Semiconductor lasers

Articles 1 to 3 of 3





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