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Chin. Opt. Lett.
Research Highlights
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Upstream dispersion management of 25 Gb/s duobinary and PAM-4 signals to support 0–40 km differential reach

We extensively discuss 25 Gb/s per wavelength capacity in both IEEE and ITU-T standardization to support the increasing bandwidth requirement. In this Letter, we propose to use the optical dispersion compensation technique in an optical line terminal (OLT) combined with a bandwidth-limited electro-absorption modulated laser in an optical network unit to achieve 25 Gb/s capacity for the upstream li...
Three-dimensional imaging lidar system based on high speed pseudorandom modulation and photon counting

High speed pseudorandom modulation and photon counting techniques are applied to a three-dimensional imaging lidar system. The specific structure and working principle of the lidar system is described. The actual detector efficiency of a single-photon detector in an imaging system is discussed, and the result shows that a variety of reasons lead to the decrease in detection efficiency. A series of...
Prototype of solar ground layer adaptive optics at the 1-m New Vacuum Solar Telescope

A prototype of a solar ground-layer adaptive optics (GLAO) system, which consists of a multi-direction correlating Shack–Hartmann wavefront sensor with 30 effective subapertures and about a 1 arcmin field of view (FoV) in each subaperture, a deformable mirror with 151 actuators conjugated to the telescope entrance pupil, and a custom-built real-time controller based on field-programmable gate arra...
Actively Q-switched ring Tm-doped fiber laser with free space structure

We report a cladding-pumped actively Q-switched ring Tm-doped fiber laser (TDFL). This laser is Q-switched by a free space acousto-optic modulator. A pulse energy up to 150 μJ with a pulse width of 207 ns at a repetition rate of 100 Hz is achieved for a cavity optical length of 6.68 m. The pulse amplitude’s stability at this repetition rate is better than 95%. To the best of our knowledge, this is...
Announcements
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COL Cover Story: Efficient upstream data transmission by joint scheme of dispersion compensation and electro-modulation [08/02/2017]

With the worldwide applications of emerging multi-mediaservices and mobile fronthaul, the user’s bandwidth demand is constantly increasing.So the passive optical network (PON) with 100 Gb/s system capacity supporting25 Gb/s data rate...
COL Cover Story: Three-dimensional imaging lidar system based on high speed pseudorandom modulation and photon counting [21/11/2016]

Laser radar technologyhas been developed rapidly since the advent of laser. Among various laser radars,the three-dimensional (3D) imaging lidar has been of great concern. Thetraditional 3D imaging radar based on direct detection mode...
Special Issue Announcement: Optical Methods for Life Sciences [10/11/2016]

Chinese Optics Letters (COL) invites original manuscript submissions for a Special Issue on Optical Methods for Life Sciences to be published in September 2017. This issue will focus on the cutting-edge optical techniques and its app...
COL Cover Story: Prototype of solar ground layer adaptive optics at the 1-m New Vacuum Solar Telescope [09/10/2016]

Adaptive optics (AO) is an indispensable technique in ground-based solar imaging which provides diffraction limited resolution. However, the traditional AO technique has only a very small corrected field of view (FoV) (~ 10 arcsec), ...
Chinese Optics Letters New Executive Editor-in-Chief Announcement [23/09/2016]

Chinese Laser Press is privileged to announce the appointment of new Executive Editor-in-Chief David Hagan for one subordinate journal of its publications,Chinese Optics Letters (COL). Dr. Hagan is Professor of Optics a...
COL Cover Story: Actively Q-switched ring Tm-doped fiber laser with free space structure [18/09/2016]

  Measurement accuracy is one of the most important indexes to estimate the capability of LIDAR systems. For Doppler LIDAR, the emission source with a proper long pulse width is beneficial to measurement accuracy. The pulse width is ...
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