搜索结果: 1-15 共查到“光学工程 W-CDMA”相关记录16条 . 查询时间(0.078 秒)
Security Enhanced SPECTS O-CDMA with Four-State Encoded Data Modulation
Networks Optical security encryption.
2015/6/9
We demonstrate a security enhancement mechanism based on four-state temporal optical coding which protects a SPECTS O-CDMA upstream link against eavesdropping including DPSK detection. The FPGA-based ...
16-channelx100-GHz Monolithically Integrated O-CDMA Transmitter with SPECTS Encoder and seven 10-GHz Mode-Locked Lasers
Photonic integrated circuits Networks
2015/6/4
We demonstrate a fully-integrated O-CDMA transmitter by monolithically integrating 7 colliding-pulse mode-locked lasers with two arrayed waveguide gratings and 16 phase modulators in InP technology.
Asynchronous and Packetized Transmission in Optical CDMA Distributed Sensor Network
Fiber optics communications Networks
2015/6/4
We demonstrate asynchronous, packetized data transmission from distributed commercial sensors in an optical CDMA network. Error-free transmission is obtained and the near-far problem is reduced using ...
Multiple Optical Private Networks Over EPON Using Optical CDMA Technique
Fiber optics communications Networks
2015/6/4
A novel architecture of multiple optical private networks (PNs) on EPON independent of OLT is experimentally demonstrated. Two active PNs are established using OCDMA, which ONUs within a PN are interc...
Optical CDMA system parameters limitations for AND subtraction detection scheme under enhanced double weight (EDW) code based on simulation experiment
optical code division multiple access
2011/5/9
The work in this paper is a simulation experiment performed by a computer program to determine
the OCDMA system parameters limitations. The system was built up with LED light source in
the transmitt...
考虑系统存在多用户干扰、背景光干扰、接收机散粒噪声、暗电流和热噪声的情况下，使用概率的并集界以及有两个判决量度相等也发生判决错误的悲观估计法，推导任意λa,λc下红外OPPM—CDMA 系统的相关接收机、单光硬限幅器相关接收机和双光硬限幅器相关接收机的误比特率上限。最后通过计算机仿真对该3种接收机的误码特性进行分析和比较。
AND-subtraction detection modified SNR equation for optical CDMA systems in PON applications
optical code-division multiple access EDW code AND-subtraction detection
2011/5/6
In this paper, AND-subtraction detection scheme compatible with OCDMA system and EDW code
was simulated. The aim of the simulation is to adjust the AND-subtraction detection SNR equation
for better ...
CDMA光器件和光模块产业化
CDMA 光模块 光器件
2008/11/19
光器件(包括发射和接收器件)是光模块的主要核心部件。CDMA模拟光模块是用于制作CDMA移动通信网光纤直放站的核心部件。它具有发光功率大、接收灵敏度高、噪声低、线性高的特点。模块内部具有完备的激光器功率控制和激光器保护电路，以及PIN探测器的偏压和RF放大电路及无光告警电路等。光器件采用自行耦合封装的激光器和探测器。激光器的控制电路采用集成芯片进行自动功率控制，带有温度补偿作用，与分立元件电路比较...
CDMA光纤直放站用单纤双向收发模块
CDMA 单纤双向 收发模块
2008/10/30
该项目开发出了应用于各类频段的CDMA光纤直放站用单纤双向收发模块，可分别应用于GSM、CDMA、PHS、3G等业务，也可用作图像和话音数据的模拟传输及数据调制后的模拟发射和接收。该模块是光纤直放站的核心组件，智能化微处理控制器具有双串口和AD转换功能，用来完成数据信息的智能化传递与控制，从根本上简化了光纤直放站模块的结构和生产，提高了产品可靠性和可生产性。该项目用单纤双向组件替代了传统的分离模块...
CDMA光纤直放站用单纤双向收发模块
CDMA 单纤双向 收发模块
2008/10/29
该项目开发出了应用于各类频段的CDMA光纤直放站用单纤双向收发模块，可分别应用于GSM、CDMA、PHS、3G等业务，也可用作图像和话音数据的模拟传输及数据调制后的模拟发射和接收。该模块是光纤直放站的核心组件，智能化微处理控制器具有双串口和AD转换功能，用来完成数据信息的智能化传递与控制，从根本上简化了光纤直放站模块的结构和生产，提高了产品可靠性和可生产性。该项目用单纤双向组件替代了传统的分离模...
大气闪烁对无线光CDMA通信系统性能的影响
无线光通信 光码分多址 大气闪烁 脉冲脉位调制
2008/9/22
将光CDMA技术应用到无线光通信中。提出了基于脉冲位置调制的二维大气无线光CDMA通信系统，并分析了该通信系统的性能。考虑多用户干扰、APD噪声以及热噪声等干扰因素的影响，采用数值分析的方法，详细分析了大气湍流引起的大气闪烁对二维无线光CDMA通信系统误码率的影响。结果表明，大气闪烁是影响二维无线光CDMA系统误码率性能的一个重要因素；当大气闪烁的对数方差较小(如σ2s=0.1)时，该系统可以实现...
Simultaneous transmission of W-CDMA and WIMAX signals over 300 m 50 μm multimode fibres using low cost 850 nm devices
Simultaneous transmission W-CDMA WIMAX signals multimode fibres
2015/8/6
Simultaneous transmission of WCDMA and WIMAX signals over 300 m multimode fibre links for indoor coverage has been demonstrated employing low cost 850 nm devices.
Integrated Frequency-Domain Optical CDMA Modulator Using Hybrid Assembly Technique with Silica PLCs and LN Phase Modulator
Integrated Frequency-Domain Optical CDMA Modulator Hybrid Assembly Technique Silica PLCs LN Phase Modulator
2015/8/3
A frequency-domain OCDMA modulator is developed by integrating PLC encoders with LN modulators. This modulator can hold data signals in phase to carry out self-homodyne detection to reduce beat noise.
Experimental Demonstration of Multicarrier-CDMA for Passive Optical Networks
Multicarrier-CDMA Passive Optical Networks
2015/7/31
Optical multicarrier-CDMA is experimentally demonstrated for the first time. The system supports up to 256 users at a total bit rate of 15-Gb/s with almost no penalty after 70-Km transmission.