| 1. |
- Chen, Jiajia, 1981-, et al.
(författare)
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Analytical Formulas for Calculating the Blocking Probability of a Dynamic Star Network
- 2005
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Ingår i: Chinese Optics Letters. - : Optical Society of America. - 1671-7694. ; 3:10, s. 579-582
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Tidskriftsartikel (refereegranskat)abstract
- For a dynamic routing and wavelength assignment (RWA) a star topology is shown to be more efficient in comparison with a ring topology. Analytical formulas for a dynamic RWA in a star network are presented and verified with virtual simulation.
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| 2. |
- Krzempek, Karol, et al.
(författare)
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Fiber-based optical frequency comb at 3.3 μm for broadband spectroscopy of hydrocarbons [Invited]
- 2021
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Ingår i: Chinese Optics Letters (COL). - : The Optical Society. - 1671-7694. ; 19:8
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Tidskriftsartikel (refereegranskat)abstract
- A 125 MHz fiber-based frequency comb source in the mid-infrared wavelength region is presented. The source is based on difference frequency generation from a polarization-maintaining Er-doped fiber pump laser and covers a spectrum between 2900 cm−1 and 3400 cm−1 with a simultaneous bandwidth of 170 cm−1 and an average output power up to 70 mW. The source is equipped with actuators and active feedback loops, ensuring long-term stability of the repetition rate, output power, and spectral envelope. An absorption spectrum of ethane and methane was measured using a Fourier transform spectrometer to verify the applicability of the mid-infrared comb to multispecies detection. The robustness and good long- and short-term stability of the source make it suitable for optical frequency comb spectroscopy of hydrocarbons.
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| 3. |
- Li, Qiang, et al.
(författare)
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All-optical NRZ-to-AMI conversion using linear filtering effect of silicon microring resonator
- 2009
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Ingår i: Chinese optics letters. - : Shanghai Institute of Optics and Fine Mechanics. - 1671-7694. ; 7:1, s. 12-14
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally demonstrate 10-Cb/s format conversion from non-return-to-zero (NRZ) to alternate-mark-inversion (AMI) using the linear filtering effect of silicon microring resonator. Our discussion and analysis in simulation further show that a 10-Gb/s AMI signal with good quality can be obtained by a resonator with a notch depth larger than 25 dB when the 3-dB bandwidth is 0.4 nm.
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| 4. |
- Liu, Hairong, et al.
(författare)
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Optimum design of anti-resonant reflecting photonic crystal vertical-cavity surface-emitting lasers
- 2005
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Ingår i: Chinese Optics Letters. - 1671-7694. ; 3:SUPPL, s. S210-S212
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Tidskriftsartikel (refereegranskat)abstract
- Anti-resonant reflecting photonic crystal structure in vertical-cavity surface-emitting lasers (VCSELs) to achieve photon confinement in lateral direction is introduced. This kind of design is proposed to support large aperture single-mode emission. A proper method to fabricate the proposed structure has also been discussed. Firstly a spacer layer will be fabricated between the active layer and pDBR layer. A hexagonal array of high-index cylinders will be designed by etching and re-growth on the spaced layer. The transverse modal property of the proposed structure has been investigated. An optimum design for the minimum radiation loss by considering of the cylinder diameter has been discussed in this paper.
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| 5. |
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| 6. |
- Wosinski, Lech, et al.
(författare)
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Technology challenges for monolithically integrated waveguide demultiplexers
- 2009
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Ingår i: CHINESE OPTICS LETTERS. - : Shanghai Institute of Optics and Fine Mechanics. - 1671-7694. ; 7:4, s. 315-318
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Tidskriftsartikel (refereegranskat)abstract
- A short overview of integrated waveguide demultiplexers for different applications ill future highly integrated optical communication systems is presented. Some fabricated devices based on amorphous silicon nanowire technology are described.
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| 7. |
- Zhang, H., et al.
(författare)
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Single-lane 200 Gbit/s photonic wireless transmission of multicarrier 64-QAM signals at 300 GHz over 30 m
- 2023
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Ingår i: Chinese Optics Letters (COL). - : Optica Publishing Group (formerly OSA). - 1671-7694. ; 21:2
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Tidskriftsartikel (refereegranskat)abstract
- Recently, wireless communication capacity has been witnessing unprecedented growth. Benefits from the optoelectronic components with large bandwidth, photonics-assisted terahertz (THz) communication links have been extensively developed to accommodate the upcoming wireless transmission with a high data rate. However, limited by the available signal-to-noise ratio and THz component bandwidth, single-lane transmission of beyond 100 Gbit/s data rate using a single pair of THz transceivers is still very challenging. In this study, a multicarrier THz photonic wireless communication link in the 300 GHz band is proposed and experimentally demonstrated. Enabled by subcarrier multiplexing, spectrally efficient modulation format, well-tailored digital signal processing routine, and broadband THz transceivers, a line rate of 72 Gbit/s over a wireless distance of 30 m is successfully demonstrated, resulting in a total net transmission capacity of up to 202.5 Gbit/s. The single-lane transmission of beyond 200 Gbit/s overall data rate with a single pair of transceivers at 300 GHz is considered a significant step toward a viable photonics-assisted solution for the next-generation information and communication technology (ICT) infrastructure.
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| 8. |
- Zhang, Ziyang, et al.
(författare)
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Subwavelength-diameter Silica Wire for Light In-coupling to Silicon-based Waveguide
- 2007
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Ingår i: Chinese optics letters. - 1671-7694. ; 5:10, s. 577-579
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Tidskriftsartikel (refereegranskat)abstract
- Coupling between subwavelength-diameter silica wires and silicon-based waveguides is studied using the parallel three-dimensional (3D) finite-different time-domain method. Conventional butt-coupling to a silica-substrated silicon wire waveguide gives above 40% transmission at the wavelength range from 1300 to 1750 nm with good robustness against axial misalignments. Slow light can be generated by counter-directional coupling between a silica wire and a two-dimensional (2D) silicon photonic crystal slab waveguide. Through dispersion-band engineering, 82% transmission is achieved over a coupling distance of 50 lattice constants. The group velocity is estimated as 1/35 of the light speed in vacuum.
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| 9. |
- Zhao, Shuxi, 1944-, et al.
(författare)
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Options for Reststrahlen Materials in Optical Surfaces and Filters
- 2010
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Ingår i: Chinese Optics Letters. - Shanghai, China : Chinese Laser Press. - 1671-7694. ; 8:Supplement 1, s. 119-124
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Tidskriftsartikel (refereegranskat)abstract
- The current potential applications of reststrahlen bands in optical surfaces and components are reviewed. This type of interval with metallic-like high reflectance has been used for monochromatization in infrared and when wavelength selective low emittance is needed for frost prevention or infrared signature reduction. Associated features, including a narrow reflectance minimum for a wide range of angles of incidence, are potentially useful.
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| 10. |
- Ågren, Hans, et al.
(författare)
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Modelling nonlinear optical effects in guest-host systems
- 2005
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Ingår i: Chinese Optics Letters (COL). - 1671-7694. ; 3:Suppl., s. S17-S22
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Tidskriftsartikel (refereegranskat)abstract
- We briefly outline a modelling strategy, combining quantum chemistry and molecular dynamics simulations, for obtaining macroscopic nonlinear optical coefficients in guest-host systems like chromophores in solutions or in polymer matrices. The parameters required for the calculation of the macroscopic nonlinear optical property, like the chromophore number density, local field factors, and the order parameter of the chromophore molecules, are derived. These parameters, together with the molecular first hyperpolarizabilities, obtained from quantum chemistry calculations, are used to estimate the macroscopic electro-optic coefficients. The combined approach leads to some new conclusions about the relation of the chromophore property and its solvent interactions in order to optimize the nonlinear optical coefficient. For instance, from the simulation results a totally different notion is derived about the collective properties of octupolar molecules. We find that such molecules receive a solvent induced dipole moment that makes it possible to pole them by an external electric field, but also that they can aggregate as an effect of this solvent interaction.
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