Transmission of eight channels×622 Mbit/s and 15channels×155 Mbit/s using spectral encoded optical CDMA

A spectral optical code division multiple access transmission system using forward error correction is demonstrated. Matching channels are recovered error-free with 15 channels operating at 155.52 Mbit/s and up to eight channels operating at 622.08 Mbit/s     

240Mbit/s直线运动型无线光通信系统研究

详细分析了直线轨道上运动通信的特点,设计和研制了一种具有双向收发功能的直线运动型无线光通信系统。该系统主要包括1 550 nm半导体激光器、高灵敏度PIN光探测器、球面单透镜式光发射天线和实心光锥耦合式光接收天线等关键部件。130 m运动工作距离的系统性能测试结果表明,在3.5 m/s最高运动速度、240Mbit/s通信传输速率下,运动中的数据丢帧率为零,以太网和视频指标均满足实际应用要求,系统适用于存在直线运动轨道的无线光通信场合。     

CMOS LED-driver and PIN-receiver for fiber optical communication at 155 Mbit/s

A test chip for an integrated full cmos led driver has been realized with a modulation current of 60 mA at a maximum bit rate of 155 Mbit/s. A cmos receiver is evaluated to amplify pin diode photo currents less than 10 μA at the same bit rate of 155 Mbit/s. Both circuits are integrated on one chip. The circuit has been developed in a 0.8 μm digital cmos process.     

Sixteen-channel coherent broadcast network at 155 Mbit/s

An experimental 155.52 Mb/s coherent broadcast network with 16 channels using a conventional distributed feedback (DFB) laser operating at 1540 nm is described. It includes absolute laser frequency stabilization, a fiber span of 74.4 km, and a balanced polarization-diversity single-filter frequency-shift keying (FSK) heterodyne receiver. At a channel spacing of 8.5 GHz a power penalty of 0.3 dB is incurred due to adjacent channel crosstalk     

An 800 Mbit/s optical transmission experiment using a single-mode fiber

It has been confirmed by a preliminary transmission experiment that a repeater spacing at 800 Mbits/s can be lengthened up to 7.3 km, by using a combination of a low-loss single-mode fiber and a well designed AlGaAs laser. The laser is modulated by a signal current superimposed on a dc bias current above the threshold. This modulation scheme avoids the spectrum broadening of the laser at the cost of extinction ratio degradation. A discrepancy of about 13 dB exists between the measured and the calculated error-rate performance curves. The major part of the discrepancy, 10 dB, is due to the extinction ratio degradation.     

Integrated circuits for a 200 Mbit/s fiber-optic link

A set of three bipolar integrated circuits for a new fiber-optic link is described. The link operates at data rates of 5-200 Mb/s NRZ. The optical transmitter and receiver modules are compact and fit into standard 16-pin dual-in-line sockets. The power consumption of the transmitter module is 530 mW and the receiver module dissipates 310 mW. The optical loss budget is 20 dB, which is sufficient for link lengths of up to 5 or 6 km. The circuits have been designed in a 3-/spl mu/m bipolar process. The chip sizes are 2 mm/spl times/1.75 mm each.     

实用化565Mbit／s光发送机

本文介绍实用于565Mbit/s速率上的光发送机,并叙述其工作性能及指标。     

560 Mbit/s optical PSK heterodyne detection using carrier recovery

An optical PSK heterodyne synchronous detection experiment was performed at a bit rate of 560 Mbit/s using carrier recovery in the IF stage. A receiver sensitivity of -51.6 dBm was achieved, and the power penalty due to the phase noise of the laser diodes was suppressed to less than that of DPSK.<>     

Coherent optical receiver for 680 Mbit/s using phase diversity

A coherent optical receiver using a multiport optical coupler to provide phase diversity is described. By this means, only homodyne bandwidth is required in the signal processing, but with tolerances on the frequency tracking typical of heterodyne systems. Measured sensitivities with limited local-oscillator power are ?47.5 dBm at 320 Mbit/s and ?42 dBm at 680 Mbit/s. The results at the higher bit rate are strongly influenced by limited receiver module bandwidth.     

同步数字体系中155Mbit/s净荷的误码测试

本文基于光纤传输同步数字体系(S D H)系统的开发背景,较为详细地总结了155Mbit/s速率下的净荷误码测试机理.最后给出了净荷的误码测试方法以及误码测试系统的信号流程.     

Low-cost 2 Mbit/s optical local line transmission system using single-mode fibre

A laboratory demonstration is reported in which low-cost optoelectronic devices are used for transmission over 9/125 ?m single-mode fibre at 2 Mbit/s. This novel system has been designed for application in local network and office systems where optical device cost constraints present severe restrictions on the technology options.     

在SDH/SONET 155Mbit/s上承载 IP包的解决之道

1前言随着近年来Internet的发展，IP网络将成为未来通信网络的重要应用平台。各大通信运营商为了传送话音业务已经铺设了采用SDH/SONET技术的庞大的光纤通信基础网络。在向统一的通信网———IP网络演变过程中，保护现有投资就成了各大通信运营商首先考虑的问题。服务供应商需要一些价格经济的解决方案，通过他们现有的SDH/SONET网络传输以太网业务。CCOM推出了基于EOS（Eth-ernetoverSDH/SONET）技术的应用产品，它能将现有的通信网中的两大技术：以太网技术和SDH/SONET技术有机地结合起来，因而保护了广大用户和通信运…     

2 Mbit/s FQPSK-2 modem for infrared wireless LAN

A 2 Mbit/s FQPSK-2 modem design and its evaluation is presented. Its main application is wireless infrared local area networks. The design is fully digital, which enables the modem to be integrated on only one chip. FQPSK-2 modulation was chosen for its high spectral efficiency, robustness against jitter, and constant amplitude of its complex envelope     

Monolithic integrated amplifiers for 400 Mbit/s optical repeater

Introduction of monolithic integrated circuit technology to high bit rate optical repeater is studied. Monolithic integrated amplifiers are realised for a 400 Mbit/s optical repeater such as a preamplifier, AGC amplifier and postamplifier, using advanced silicon bipolar process technology. An equalising amplifier with four monolithic amplifiers got 66 dB maximum gain, 35 dB variable gain and 350 MHz band-width with 550 mW power consumption.     

MIMO characterization of indoor wireless optical link using a diffuse-transmission configuration

Performance of a diffuse optical link may potentially be degraded by temporal dispersions resulting from surface reflections. In order to devise techniques to alleviate the adverse effect of dispersion, an accurate channel model is needed. Obtaining the impulse response (IR) for a given receiver location requires consideration not only of the direct path, but also of reflections up to nth order. The IR is only valid for a specific location and specific receiver parameters. If a receiver moves, the IR has to be recalculated. We propose a new approach for characterizing diffuse links that results in a tremendous saving in calculation and also gives more insight into the channel characteristics. The new approach is based on consolidating the dependence of receiver parameters, transmitter parameters, and the indoor environment into independent components. Thus, changing one of the parameters of the link requires recalculation of one of these components. The new model is utilized to obtain an accurate profile of delay spread and received power throughout a room.     

155 Mbit/s transmission using ASE-injected Fabry-Perot laser diode in WDM-PON over 70/spl deg/C temperature range

Thermal reliability of an uncooled Fabry-Perot laser diode (F-PLD) wavelength-locked to spectrum-sliced amplified spontaneous emission (ASE) as a source for wavelength division multiplexed-passive optical networks (WDM-PONs) is presented. An F-PLD with narrow mode spacing and asymmetric facet reflectivity relieved temperature dependency of transmission and power requirement of ASE injection. The chip temperature range of error-free transmission at 155 Mbit/s extended over 70/spl deg/C with -22 dBm ASE injection.     

Effects of dispersion in a 565 Mbit/s optical fibre laboratory system

565 Mbit/s system tests are described, aimed at revealing the combined effects of pulse-broadening and mode-partition dispersion, which are of principal interest in system design. The tests make use of single-mode fibres with dispersion zeros at both 1300 and 1550 nm.     

Transmission experiments at 560 Mbit/s and 140 Mbit/s using single-mode fibre and 1300 nm LEDs

Transmission at 560 Mbit/s has been demonstrated using single-mode fibre and LEDs at 1300 nm. Surface-emitting, edge-emitting and super-radiant LEDs were used to transmit over maximum distances of 4.5 km, 15 km and 25 km, respectively. At 140 Mbit/s, the corresponding distances achieved with the same set of LEDs are 7.5, 35 and 50 km. respectively.     

116 photons/bit in a 565 Mbit/s optical DPSK heterodyne transmission experiment

A 565 Mbit/s DPSK heterodyne experiment is presented. A sensitivity of -50.0 dBm at the receiver input was achieved, which is the best reported value for this data rate. The experimental data match the theory within 1.4 dB.<>     

Operation trial of 400 Mbit/s submarine optical transmission system

The letter reports the 8000 m deep-sea trial of a 400 Mbit/s submarine optical system, FS-400M, which was carried out in the Ogasawara trench in November 1984. Two repeaters fully integrated by six monolithic ICs, and 28 km-long submarine cables were used. In addition to transmission experiments for repeater spacing of 40 km, repair operation was simulated to confirm operational feasibility of the FS-400M.