Distribution of DVB-C Channels over an Externally Modulated Optical Link

2012 ◽  
Vol 33 (33) ◽  
pp. 37-41
Author(s):  
Paulo Andrade ◽  
Mário Lima ◽  
António Teixeira
Keyword(s):  
Second Order ◽  
Minimum Point ◽  
Optical Link ◽  
Transmission Minimum ◽  
Mach Zehnder Modulator ◽  
Noise Ratio

Abstract In this paper, we will study, via simulation, the transmission of DVB-C channels over an external modulated optical link using a Mach-Zehnder modulator (MZM). We will also observe the consequences of biasing the MZM near its transmission minimum point, which allows higher carrier to noise ratio at the transmitter, but increases second-order distortion at the receiver.

On Minimum-Point Second-Order Designs

Technometrics ◽  
1974 ◽  
Vol 16 (4) ◽  
pp. 613-616 ◽  
Author(s):  
Michael J. Box ◽  
Norman R. Draper
Keyword(s):  
Second Order ◽  
Minimum Point

Postcompensation for nonlinearity of Mach–Zehnder modulator in radio-over-fiber system based on second-order optical sideband processing

2012 ◽  
Vol 37 (5) ◽  
pp. 806 ◽  
Author(s):  
Guoqiang Zhang ◽  
Xiaoping Zheng ◽  
Shangyuan Li ◽  
Hanyi Zhang ◽  
Bingkun Zhou
Keyword(s):  
Radio Over Fiber ◽  
Second Order ◽  
Fiber System ◽  
Mach Zehnder Modulator ◽  
Radio Over Fiber System

scholarly journals 320 Channel Optically Amplified 1550 nm Light wave Directly Modulated CATV Transport System Performance Improvement Using Optical Injection Technique

2020 ◽  
Vol 16 (2) ◽  
Author(s):  
Tanvir Hossain ◽  
Tadbirul Islam ◽  
Mohammad Nasir Uddin
Keyword(s):  
Transport System ◽  
Light Wave ◽  
Signal To Noise Ratio ◽  
Second Order ◽  
Optical Injection ◽  
Injection Technique ◽  
Photon Density ◽  
Channel Density ◽  
Transmission Distance ◽  
Noise Ratio

This paper proposed and successfully demonstrated 320 channel optically amplified 1550 nm light wave directly modulated high channel density CATV transport system. The optical injection technique increases the photon density of the modulation section and improves the overall performance of the fiber optical CATV system. Designed network demonstrates the improvement of transmission distance and channel density. Good performance in terms of output power, Composite Triple Beat (CTB), Signal to Noise Ratio (SNR), Composite Second Order (CSO) and Carrier to Noise ratio (CNR) has been observed by utilizing optical injection technique. Almost about 74 dBm Composite Second Order (CSO) has been achieved by utilizing 14 dBm optical injection techniques.

scholarly journals Asymmetric second-order stochastic resonance weak fault feature extraction method

2020 ◽  
Vol 53 (5-6) ◽  
pp. 788-795
Author(s):  
Jiachen Tang ◽  
Boqiang Shi
Keyword(s):  
Stochastic Resonance ◽  
Output Signal ◽  
Background Noise ◽  
Signal To Noise Ratio ◽  
Resonance Method ◽  
Second Order ◽  
Resonance System ◽  
Signal To Noise ◽  
Weak Fault ◽  
Noise Ratio

To solve the problem that the weak fault signal is difficult to extract under strong background noise, an asymmetric second-order stochastic resonance method is proposed. By adjusting the damping factor and the asymmetry, weak signals, noise, and potential wells are matched to each other to achieve the best stochastic resonance state so that weak fault characteristics can be effectively extracted in strong background noise. Under adiabatic approximation, the effects of damping coefficient, noise intensity, and asymmetry on the output signal-to-noise ratio are discussed based on the two-state model theory. Under the same parameters, the output signal-to-noise ratio of the asymmetric second-order stochastic resonance system is better than that of the underdamped second-order stochastic resonance system. The bearing fault and field engineering experimental results are provided to justify the comparative advantage of the proposed method over the underdamped second-order stochastic resonance method.

Sign in / Sign up

Export Citation Format

Share Document