Optimized design of quasi-optical source-array of solid state source power combiner at frequency 100 GHz

1990 ◽  
Vol 11 (11) ◽  
pp. 1269-1283 ◽  
Author(s):  
Qiao-min Wang ◽  
Cheng-tian Xue ◽  
Hui-zhen Li ◽  
Fa-xiang Wu
Keyword(s):  
Solid State ◽  
Optimized Design ◽  
Power Combiner ◽  
Optical Source ◽  
Source Power ◽  
Source Array

6mm Solid state source power combiner

1988 ◽  
Vol 9 (4) ◽  
pp. 385-393 ◽  
Author(s):  
Chengtian Xue ◽  
Shulai Zhao ◽  
Qiaomin Wang ◽  
Shuangming Zhang
Keyword(s):  
Solid State ◽  
Power Combiner ◽  
Source Power

scholarly journals Hiding Stealth Optical CDMA Signals in Public BPSK Channels for Optical Wireless Communication

2018 ◽  
Vol 8 (10) ◽  
pp. 1731 ◽  
Author(s):  
Chih-Ta Yen ◽  
Jen-Fa Huang ◽  
Wen-Zong Zhang
Keyword(s):  
Optical Cdma ◽  
Free Space Optical ◽  
Secret Data ◽  
Optical Source ◽  
Source Power ◽  
The Public ◽  
Shift Keying ◽  
Public Channel ◽  
Code Division Multiple ◽  
Public Signal

A new optical steganography scheme is proposed that transmits a stealth optical code-division multiple-access (OCDMA) signal through a public binary phase-shift keying (BPSK) channel. Polarization beam splitters and arrayed waveguide gratings are used to implement a spectral-polarization coding (SPC) system with an incoherent optical source. We employ a Walsh–Hadamard code as the signature code of the user who wants to transmit stealth information using the system. A free space optical link applied to this system maintains the polarization states of light during propagation. The secret data are extracted using correlation detection and balanced subtraction in the OCDMA decoder of the intended receiver, and the other signal from the public channel is reduced by the OCDMA decoder. At the demodulator of the public channel, BPSK demodulation eliminates the stealth signal so that the public channel is not affected by the stealth signal. The two signals cannot interfere with each other. The results of this study show that our proposed optical steganography system is highly secure. The stealth signal can be favorably hidden in the public channel when the average source power of the stealth signal, public noise, and public signal are −5, −3, and 0 dBm, respectively.

A new kind of compound solid-state quasi-optical power combiner

1991 ◽  
Vol 12 (7) ◽  
pp. 811-818 ◽  
Author(s):  
Jun Xiang Ge ◽  
Si Fan Li ◽  
Yi Yuan Chen
Keyword(s):  
Solid State ◽  
Optical Power ◽  
Power Combiner

A mobile Pulsed Ring Down source array using low power solid state radiators

2011 ◽  
Author(s):  
D. Reale ◽  
J. Mankowski ◽  
S. Holt ◽  
J. Walter ◽  
J. Dickens
Keyword(s):  
Solid State ◽  
Low Power ◽  
Source Array

scholarly journals Hiding Stealth Optical CDMA Signals in Public BPSK Channels for Optical Wireless Communication

2018 ◽  
Author(s):  
Chih-Ta Yen ◽  
Jen-Fa Huang ◽  
Wen-Zong Zhang
Keyword(s):  
Optical Cdma ◽  
Free Space Optical ◽  
Secret Data ◽  
Optical Source ◽  
Source Power ◽  
The Public ◽  
Shift Keying ◽  
Public Channel ◽  
Code Division Multiple ◽  
Public Signal

A new optical steganography scheme is proposed that transmits a stealth optical code-division multiple-access (OCDMA) signal through a public binary phase-shift keying (BPSK) channel. Polarization beam splitters and arrayed waveguide gratings are used to implement a spectral-polarization coding (SPC) system with an incoherent optical source. We employ a Walsh–Hadamard code as the signature code of the user who wants to transmit stealth information using the system. A free space optical link applied to this system maintains the polarization states of light during propagation. The secret data is extracted using correlation detection and balanced subtraction in the OCDMA decoder of the intended receiver, and the other signal from the public channel is reduced by the OCDMA decoder. At the demodulator of the public channel, BPSK demodulation eliminates the stealth signal so that the public channel is not affected by the stealth signal. The two signals cannot interfere with each other. The results of this study show that our proposed optical steganography system is highly secure. The stealth signal can be favorably hidden in the public channel when the average source power of the stealth signal, public noise, and public signal are −5, −3, and 0 dBm, respectively.

A global optimization design for quasi-optics power combiner of 3mm wave solid-state sources

1991 ◽  
Vol 12 (12) ◽  
pp. 1425-1436 ◽  
Author(s):  
Hui-Zhen Li ◽  
Cheng-tian Xue ◽  
Xiang-wen Chen
Keyword(s):  
Global Optimization ◽  
Solid State ◽  
Optimization Design ◽  
Power Combiner

scholarly journals A Surgical Pen-Type Probe Design for Real-Time Optical Diagnosis of Tumor Status Using 5-Aminolevulinic Acid

Diagnostics ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1014
Author(s):  
Kicheol Yoon ◽  
Kwanggi Kim ◽  
Seunghoon Lee
Keyword(s):  
Aminolevulinic Acid ◽  
Blind Spot ◽  
Probe Design ◽  
Ambient Light ◽  
Optical Source ◽  
Source Power ◽  
Surgical Microscope ◽  
Working Distance ◽  
The Right ◽  
Blind Spots

A surgical microscope is large in size, which makes it impossible to be portable. The distance between the surgical microscope and the observation tissue is 15–30 cm, and the adjustment range of the right and left of the camera is a maximum of 30°. Therefore, the surgical microscope generates an attenuation (above 58%) of irradiation of the optical source owing to the long working distance (WD). Moreover, the observation of tissue is affected because of dazzling by ambient light as the optical source power is strong (55 to 160 mW/cm2). Further, observation blind spot phenomena will occur due to the limitations in adjusting the right and left of the camera. Therefore, it is difficult to clearly observe the tumor. To overcome these problems, several studies on the handheld surgical microscope have been reported. In this study, a compact pen-type probe with a portable surgical microscope is presented. The proposed surgical microscope comprises a small and portable pen-type probe that can adjust the WD between the probe and the observed tissue. In addition, it allows the adjustment of the viewing angle and fluorescence brightness. The proposed probe has no blind spots or optical density loss.

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