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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 5 of 5

November


Compact on-chip 1 × 2 wavelength selective switch based on silicon microring resonator with nested pairs of subrings

  • Jiayang Wu, Pan Cao, Ting Pan, Yuxing Yang, Ciyuan Qiu, Christine Tremblay, and Yikai Su
  • received 08/18/2014; accepted 11/07/2014; posted 11/07/2014; Doc. ID 221087
  • [full text: PDF (1875) KB)]
  • Abstract: We propose and experimentally demonstrate compact on-chip 1 × 2 wavelength selective switch (WSSs) based on silicon microring resonators (MRRs) with nested pairs of subrings (NPSs). Owing to the resonance splitting induced by the inner NPSs, the proposed devices are capable of performing selective channel routing at certain resonance wavelengths of the outer MRRs. System demonstration of dynamic channel routing using fabricated devices with one and two NPSs are carried out for 10-Gb/s non-return-to-zero (NRZ) signal. The experimental results verify the effectiveness of the fabricated devices as compact on-chip WSSs.

Keywords (OCIS):

  • (230.3120) Optical devices : Integrated optics devices
  • (230.5750) Optical devices : Resonators
  • (130.4815) Integrated optics : Optical switching devices

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

Dynamics of passively mode-locked semiconductor lasers with bandgap shifted saturable absorbers

  • Vincenzo Pusino, Michael Strain, and Marc Sorel
  • received 08/14/2014; accepted 10/23/2014; posted 11/05/2014; Doc. ID 216715
  • [full text: PDF (2324) KB)]
  • Abstract: The mode-locking behavior of passively mode-locked semiconductor lasers in a Fabry-Pérot configuration with a bandgap blue-shift applied to the saturable absorber section has been experimentally characterized. The quantum well intermixing technique was adopted to modify the material bandgap in the saturable absorber section. The measurements showed a significant expansion of the range of bias conditions providing stable mode-locking. Moreover, a narrowing of the pulse width, a reduction of the chirp affecting the pulse and an increased peak power with respect to devices whose absorbing sections were not intermixed was observed.

Keywords (OCIS):

  • (130.3120) Integrated optics : Integrated optics devices
  • (140.4050) Lasers and laser optics : Mode-locked lasers
  • (140.3538) Lasers and laser optics : Lasers, pulsed
  • (250.5960) Optoelectronics : Semiconductor lasers

September


Optical mode study of III-V nanowires based nanophotonic crystals for an integrated infrared band microlaser

  • zhen lin, michel gendry, and Xavier Letartre
  • received 04/04/2014; accepted 09/19/2014; posted 10/30/2014; Doc. ID 209609
  • [full text: PDF (1118) KB)]
  • Abstract: In this paper, we study an original strategy to generate an infrared waveband microlaser by integrated III-V NWs based photonic array for on chip interconnects. The optical modes of III-V nanowires based photonic array are investigated for utilization as all-in-one gain medium, waveguide and cavity. Adequate designs of periodic arrays of InP NWs with different polarisations TM and TE mode are studied by 3D electromagnetic simulations FDTD to optimise the resonant active photonic crystal (hybrid Bloch modes) in infrared band at 1.3 μm. According to our calculations, nanowires which are bigger than 0.2μm in diameter are needed to conceive optic modes inside NWs photonics in TM polarisation. However, smaller NWs photonics, such as 0.1μm in diameter, can only obtain TE mode inside the NWs. This phenomenon is theoretically illustrated by the dispersive curves of NWs based photonics. It aims at demonstrating that the slow velocity mode inside the NWs photonics will cause amplification of light wave and generate microlaser in infrared band at 1.3 μm. These studies are of prime importance for further microlaser integration to SOI waveguide for on chip optic-interconnect.

Keywords (OCIS):

  • (140.3070) Lasers and laser optics : Infrared and far-infrared lasers
  • (140.4780) Lasers and laser optics : Optical resonators
  • (140.5960) Lasers and laser optics : Semiconductor lasers
  • (140.3945) Lasers and laser optics : Microcavities
  • (230.5298) Optical devices : Photonic crystals

Articles 1 to 5 of 5





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