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Clinical diagnostic imaging modalities of breast cancer are still having certain limitations such as low sensitivity in dense breast in mammography and low specificity of the B-mode ultrasound [1, 2]. Photoacoustic (PA) imaging has been introduced as an enabling tool to acquire important functional information of the pathologic tissues as well as molecular imaging of cancer when it is augmented with...
We investigate a pointing and tracking approach for an OAM multiplexing free-space communication link based on the measurement of the intensity gradient of the received beam. The OAM intensity gradient-based approach may potentially improve the system's tracking accuracy.
We report a transmission of 400 Gbit/s signal over a four channels, 1-meter mode-division-multiplexed free space optical communication link using multiple orbital-angular-momentum beams with non-zero radial indices, achieving a power penalty less than 6 dB.
We design and experimentally demonstrate a free-space distance emulator for propagating OAM beams over long distances in a lab environment. The performance of the system is assessed by measuring spot radius and radius of curvature of propagated beams.
We analyze and measure the performance metrics for a free-space communication link using OAM beams with non-zero radial index p. The received power of OAM beams with p=1 is ∼6 dB higher than p=0.
Using beam divergence controlling to mitigate angular error effects in OAM-based FSO links is investigated through simulation and experiment. Results show that controlling beam divergence allows reducing power loss and angular error induced channel crosstalk.
We compared power spreading of a partially captured orbital-angular-momentum (OAM) beam by using single and double apertures. Double apertures could help reducing crosstalk from OAMl to OAMl+m by ∼10 dB, where l is an integer and m is an odd number.
In this paper, we present a free-space link utilizing orbital angular momentum (OAM) multiplexing, where only a proportion of the beam is received. Partially receiving an OAM mode could lead to crosstalk between neighboring modes. Here, we analyzed the effect of the aperture size on the system crosstalk both numerically and experimentally. We also demonstrated an optical data link with a total capacity...
Multiplexing/demultiplexing of 1008 data channels using orbital angular momentum (OAM) mode-division-multiplexing combined with wavelength-division-multiplexing is demonstrated. 24 OAM modes, each carrying 42 wavelengths, and each wavelength transporting a 100 Gbit/s QPSK signal, are multiplexed, with an aggregated capacity of 100.8 Tbit/s.
We propose reconfigurable optical add/drop multiplexing in a data link using orbital angular momentum (OAM) mode division multiplexing. Adding/dropping of one OAM mode from three multiplexed OAM modes, each carrying 100 Gbit/s QPSK data is demonstrated, with an OSNR penalty of <; 2dB.
We demonstrate OAM-based reconfigurable optical switching functions among multiple OAM modes. Three-pair OAM modes exchange shows 3.6-dB conversion efficiency and selective data exchange among three 100-Gb/s QPSK OAM channels has a 2.1-dB OSNR penalty.
A tunable orbital angular momentum (OAM) mode filter is proposed. Filtering/blocking selected channels from 4 spatially multiplexed OAM channels is demonstrated. An OSNR penalty of <2 dB is observed when using the filter for 100 Gb/s QPSK data channels.
We present OAM mode distortion monitoring by using an interferometer with π/2 phase-shift to reconstruct the phase profile without any movement of instruments. Monitoring of distortion caused by misalignment and atmospheric turbulence are successfully demonstrated.
We propose and demonstrate data exchange between two spatial modes carrying orbital-angular-momentum (OAM). Reconfigurable OAM exchange accompanied by 100-Gbit/s DQPSK data exchange is implemented. A total power penalty of less than 2.4 dB is observed at a BER of 1e-9.
We demonstrate generation/multiplexing/demultiplexing of polarization-multiplexed (pol-muxed) multiple orbital-angular-momentum (OAM) modes. High spectral efficiency of 25.6-bit/s/Hz is implemented using 10.7-Gbaud 16-QAM signals over pol-muxed four OAM modes. An OSNR penalty less than 3.5 dB is observed.
A mid-infrared detector array is developed to measure far-field laser beam spatial profile. The array has high spatial sample rate, good temperature adaptability, low measurement uncertainty and high dynamic range.
Four-wave mixing between a coherent laser signal and incoherent pump in highly nonlinear fiber are investigated theoretically and experimentally, and the effect of incoherence pump on signal is studied.
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