The self-homodyne coherent detection (SHCD) system is becoming more popular in intra-data center applications nowadays. However, for a high-speed SHCD system, the device imperfection such as transmitter (Tx) and receiver (Rx) side in-phase (I)/quadrature-phase (Q) time skew and bandwidth limitation will greatly restrict the transmission performance. The current mainstream calibration methods for traditional optical transceivers rely on the effect of frequency offset and phase noise to separate the Tx and Rx imperfection, which is not compatible with the SHCD system. In this paper, we have proposed and demonstrated a highly precise calibration method that can be applied in dual-polarization (DP) SHCD system. Based on the specially designed multi-tone signals, the amplitude/phase frequency response (AFR/PFR) of the transceiver and the Tx/Rx IQ skew can be obtained by just one measurement even after long-distance fiber transmission. By using a 4 MHz linewidth distributed feedback (DFB) laser, a DP SHCD transmission system combined with a 20 GHz optical transceiver and two 10 km standard single-mode fibers is experimentally constructed. The test results indicate that the measurement error of the AFR/PFR and Tx/Rx skew are within ±1dB/±0.15rad and ±0.3ps respectively, and the dynamic range for IQ skew calibration can reach dozens of picoseconds. The measured bit error rate value of 46GBaud DP-16QAM signals/35GBaud DP-64QAM signals are improved from 2.30e-2 to 2.18e-3/9.59e-2 to 2.20e-2 with the help of the proposed calibration method.
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- The self-homodyne coherent detection (SHCD) system is shown to effectively integrate with the Brillouin optical time-domain analyzer (BOTDA), allowing for enhanced transmission capabilities.
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A neoadjuvant therapy compatible prognostic staging for resected pancreatic ductal adenocarcinoma.
BMC Cancer
August 2023
Department of Pancreatic Hepatobiliary Surgery, Changhai Hospital, Naval Medical University, NO. 168 Changhai Road, Yangpu District, Shanghai, China.
Objective: To improve prediction, the AJCC staging system was revised to be consistent with upfront surgery (UFS) and neoadjuvant therapy (NAT) for PDAC.
Background: The AJCC staging system was designed for patients who have had UFS for PDAC, and it has limited predictive power for patients receiving NAT.
Methods: We examined 146 PDAC patients who had resection after NAT and 1771 who had UFS at Changhai Hospital between 2012 and 2021.
The self-homodyne coherent detection (SHCD) system is becoming more popular in intra-data center applications nowadays. However, for a high-speed SHCD system, the device imperfection such as transmitter (Tx) and receiver (Rx) side in-phase (I)/quadrature-phase (Q) time skew and bandwidth limitation will greatly restrict the transmission performance. The current mainstream calibration methods for traditional optical transceivers rely on the effect of frequency offset and phase noise to separate the Tx and Rx imperfection, which is not compatible with the SHCD system.
View Article and Find Full Text PDFIn this Letter, we propose a cost-efficient bi-directional (BiDi) polarization-multiplexed self-homodyne coherent detection (SHCD) system, in which only one fiber link and one adaptive polarization controller (APC) are required. By employing the correlation of the state of polarization (SOP) between the upstream and downstream light, one APC is capable of stabilizing SOPs of the counterpropagating waves at the same time. The signal and local oscillator (LO) can be optically split by a polarization beam splitter (PBS), relaxing pressure of the digital signal processing (DSP) and simplifying the coherent receiver.
View Article and Find Full Text PDFBuilding Patient-Physician Trust: A Medical Student Perspective.
Acad Med
July 2020
N. Gupta is a second-year medical student, Mayo Clinic Alix School of Medicine, Scottsdale, Arizona. C.M. Thiele is a second-year medical student, Mayo Clinic Alix School of Medicine, Scottsdale, Arizona. J.I. Daum is a second-year medical student, Mayo Clinic Alix School of Medicine, Scottsdale, Arizona. L.K. Egbert is a second-year medical student, Mayo Clinic Alix School of Medicine, Scottsdale, Arizona. J.S. Chiang is a second-year medical student, Mayo Clinic Alix School of Medicine, Scottsdale, Arizona. A.E. Kilgore Jr is a second-year medical student, Mayo Clinic Alix School of Medicine, Scottsdale, Arizona. C.D. Johnson is a consultant, Department of Radiology, Mayo Clinic Hospital, Scottsdale, Arizona.
Public trust in physicians has declined over the last 50 years. Future physicians will need to mend the patient-physician trust relationship. In conjunction with the American Medical Association's Accelerating Change in Medical Education initiative, the Mayo Clinic Alix School of Medicine implemented the Science of Health Care Delivery (SHCD) curriculum-a 4-year curriculum that emphasizes interdisciplinary training across population-centered care; person-centered care; team-based care; high-value care; leadership; and health policy, economics, and technology-in 2015.
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