Study of surface mounting of PLC on optical fibre circuit board

The first surface mounting of a planar lightwave circuit (PLC) on an optical fibre circuit board is proposed and demonstrated. Both surface mounting and physical contact connection between a PLC type duplex 1×16 splitter and fibres were realised     

Design of enhanced MT-RJ type connector for physical contact

An enhanced MT-RJ type connector was constructed employing a compact two-fiber ferrule in a newly designed housing for high-density optical duplex connection. The ferrule and the connector housing is designed to achieve physical contact (PC). As a result, the connectors we fabricated perform very well and provide ease of operation by means of direct core endface contact between the plugs. This connector is highly effective for use in the duplex connection of advanced optical networks.     

Very small single-mode ten-fiber connector

A small plastic molded single-mode ten-fiber connector has been developed for high-count optical subscriber cables. The connector ferrule alignment mechanism is designed with a sufficient factor of safety to allow rough handling during connection. The ferrules are precisely aligned by alignment pins and guide sleeve. The fabricated connector, which has a cross section of just 4 mm × 6 mm, exhibited an average loss of 0.4 dB and reconnection time of less than 0.5 min. Connection loss does not change after over 1000 reconnections     

Multimode and single-mode fiber connectors technology

Various optical fiber connectors using a graded-index fiber have been fabricated and good performances have been obtained during field trial tests. The average connection loss of aC-type, plug-in type, andU-link connector has been found to be 0.4, 0.34, and 0.62 dB, respectively. A new field assembly (FA) type connector using a precision made ceramic capillary has also been developed. This FA type connector is fabricated for use with single-mode fibers, and has a connection loss of 0.56 and 0.52 dB at 0.85 and 1.3 μm, respectively. By using coupling experiments between laser diodes and single-mode fibers, a laser module with a coupling loss of 1.8 dB under optimum alignment conditions has been fabricated.     

可编程控制器运行可靠性探讨

由于可编程控制器是整个运行系统的大脑,它的稳定性决定了整个控制系统是否能够"健康"地工作.从安装环境、抗电磁干扰、配线方式改进和维护通讯系统正常工作4个方面论述了具体的保护措施,以减少可编程控制器在运行过程中出故障的频率,达到提高其运行可靠性及其寿命的目的.     

A novel method for fabrication of a PLC platform for hybridintegration of an optical module by passive alignment

A novel fabrication method and structure of a planar lightwave circuit (PLC) platform for hybrid integration of an optical module by passive alignment technology is presented. Precise formation of V-grooves in the PLC platform can be easily obtained by the proposed process. The passive alignments of optical elements, including optical fiber, are achieved in one-mask. LD modules were implemented by the proposed method     

浅谈光纤光缆接续损耗的降低

随着光纤通信的迅猛发展,用户终端对信号传输的质量要求越来越高。为了提高光缆线路接续质量,降低光纤的接续损耗,分析了光纤接续损耗的原因,结合实践经验针对熔接接续、活动接续和机械接续三种光缆接续方式介绍了降低其接续损耗的措施。     

Performance of MSE configured PLC optical equalizers for chromatic dispersion compensation

In this letter, we propose a mean square error (MSE) strategy to control a planar lightwave circuit (PLC) optical equalizer. We show by simulation that MSE is a suitable criterion to exploit the PLC programmability for realizing an adaptive optical equalizer. When controlled through the MSE criterion, a PLC equalizer for chromatic dispersion compensation performs better than with other control strategies and turns out to be effective even with few component elements.     

Adaptive minimum MSE controlled PLC optical equalizer for chromatic dispersion compensation

With the advent of very high-bit-rate optical communication systems (40 Gb/s and beyond) and the progressive transformation of the optical layer in a real networking layer, a channel-by-channel adaptive optical equalization will be needed. An adaptive optical equalizer for chromatic dispersion compensation, based on planar lightwave circuit (PLC) technology and controlled by a minimum mean square error (MSE) strategy, is proposed here. It is shown in a rigorous manner how the PLC parameters are to be adjusted and that the control algorithm is effective even with a few stages PLC equalizer, performing better than other nonadaptive control techniques. An analysis of the dynamic behavior of the equalizer shows that, in a realistic time-varying scenario, it can easily adapt to slow channel variations and is able to quickly restore a minimum MSE condition after an abrupt chromatic dispersion variation.     

Novel field installable optical fiber splice and connector for optical access networks

We have developed two types of field installable connection techniques. One is mechanical splicing, which is used to connect coated optical fibers without the need for stripping or cleaning procedures. The other is a field assembly connection technique, which employs a new type of field installable connector that makes it possible to realize a physical contact connection with chamfer grinding. Mechanical splicing is achieved by precisely aligning and directly connecting coated fibers with a capillary. The assembled splice is installed with 1.3-μm single-mode fibers that have an 80-μm cladding and a 125-μm coating and they exhibit good optical performance with a low average insertion loss of 0.2 dB. Connection is achieved with our developed field installable connector by using a chamfered fiber endface and the compression force of the buckled fiber. The assembled connectors achieve physical contact with the chamfered fiber endface, which provides good optical performance with a low insertion loss of 0.11 dB.     

A 10 Gb/s hybrid-integrated receiver array module using a planarlightwave circuit (PLC) platform including a novel assembly regionstructure

A planar lightwave circuit (PLC) platform for optoelectronic hybrid integration shows potential for achieving 10 Gb/s operation. It uses AuSn bump-type bonding pads on a silica layer to decrease parasitic capacitance, which limited the CR time constant in the optical chip assembly region, and two-layer electrical wiring to reduce parasitic inductance, which caused resonance in the electrical circuit region. An arrayed receiver module fabricated by integrating a two-channel monolithic opto-electronic integrated circuit (OEIC) chip on the PLC platform demonstrated a 3 dB-bandwidth of 8 GHz in both channels, which is equal to the bandwidth of the OEIC chip. This shows the feasibility of using this PLC platform for multichannel 10 Gb/s operation. Furthermore, this PLC platform can combine the versatile optical circuit functions of a PLC, such as an arrayed-waveguide grating wavelength multiplexer, with the high-speed signal processing function of mature electronic IC circuits. Consequently, this platform is a key device that will lead to high-capacity optical signal processing systems using optical wavelength/frequency routing     

Compact and self-retentive multi-ferrule optical backpanelconnector

A compact optical backpanel connector called a compact and self-retentive multi-ferrule optical backpanel connector or an MU optical backpanel connector has been developed Eight plugs/jacks can be installed within the MU backpanel connector which is 42 mm high and 13 mm wide. A novel self-retentive mechanism, 1.25-mm diameter ferrules and advanced PC (APC) technology are used to realize a high performance connector with a low insertion loss of 0.1 dB and a high return loss of 50.3 dB     

三菱PLC与上位机串行通信的实现

为了实现对现场生产过程进行监控,PLC串行通信技术在工业生产中正得到越来越广泛的应用,介绍了三菱FX2N系列PLC与上位机进行通信的主要原理,阐述在Visual Basic 6.0环境下上位机与三菱FX2N PLC串行通信的具体实现方法。具体介绍了与上位机通信的硬件连接,三菱FX2N PLC的通信协议及VB中的MSCOMM控件,对通信实现过程中的主要程序进行简单分析。     

40-channel in-line optical power monitor integrated on 2.5%-Δ silica PLC using out-of-plane micromirror arrays

A compact 40-channel in-line optical power monitor was integrated on a 2.5%-Δ silica-based planar lightwave circuit (PLC). Two 20-channel chip-scale-packaged photodiodes were surface-mounted on the PLC, in which out-of-plane micromirror arrays were integrated. A high responsivity of 0.9?1.1 A/W was obtained.     

Present Status of Mechanical Connectors for Optical Fiber

Trunk transmission network systems connecting exchange offices were the first transmission systems using optical fiber cables. Subscriber network systems connecting the exchange office with each subscriber including local area networks or CATV network systems are under development at present. Two main techniques are newly required to be developed for making optical fiber mechanical connectors for optical fiber subscriber network system realization. The first is to realize a new connector with a high return loss and a low connecting loss. The second is to cut the joining cost of optical fibers. The newly developed "optical contact connector" realized a high return loss of more than 25 dB and a low connecting loss of 0.15 dB average value. A newly developed "multifiber connector" which can connect many optical fibers at the same time can save time and space for joining fiber cables, and also a "plastic molding technique" can save the cost of the connector. The performance of all these connectors is the same as that of the "optical contact connector." This paper describes the present status of the technique to obtain a high return loss connector, a multifiber connector, and a plastic molded connector for the subscriber network system.     

Reduction of CM Noise Emissions From PLC Modem Using Optically Coupled Signaling

This paper investigates the feasibility of implementing an optical coupler in the analog front-end (AFE) circuit of a power line communication (PLC) modem to reduce the common mode (CM) noise coupling onto the power lines. Based on a two-current-probe measurement approach, an equivalent CM circuit model is developed to predict the expected CM current generated by the PLC modem when it is plugged onto the power line network. The model provides insight into the CM noise coupling mechanism from any PLC modem onto the power line network, so that the effectiveness of using an optical coupling technique in reducing the CM current from the power line network can be properly quantified     

Passive alignment method of polymer PLC devices by using a hot embossing technique

A novel fabrication process using a hot embossing technique has been developed for micromechanical passive alignment of polymer planar lightwave circuit (PLC) devices. With only one step of embossing, single-mode waveguide straight channels and micropedestals for passive aligning are simultaneously defined on a polymer thin film with an accuracy of /spl plusmn/0.5 /spl mu/m. This process reduces the steps for fabricating alignment structures. A fabricated polymer PLC chip and fibers are combined on a v-grooved silicon optical bench (SiOB) in a flip-chip manner. The process provides a coupling loss as low as 0.67 dB per coupling face and a cost-effective packaging solution for various polymer PLC devices.     

PLC控制系统可靠性研究

PLC控制系统的可靠性从硬件和软件方面共同衡量。从电源的处理、连接线的方式、冗余设计、控制系统的输入电路和输出电路与PLC的软件程序编制等多个方面,论述了一些可行的方法和措施。     

基于PLC的微结构光纤毛细管自动剪切收集排布系统

本文使用一套基于西门子S7-200系列可编程序控制器(PLC)的系统来实现微结构光纤毛细管自动剪切、收集和排布。系统由旋转编码器配合PLC高速计数器指令来测量长度,由二氧化碳激光器进行毛细管的横向剪切,通过替换各种形状光纤毛细管收集器可以收集并进行各种形状光纤的自动排布,同时可以显示、设定切割长度和切割次数。     

SPM光纤连接器端面几何参数干涉测量仪

分析了光纤连接器端面几何参数对光纤连接器性能的影响,提出了一种利用正弦相位调制(SPM)干涉仪测量光纤连接器端面几何参数的新方法。计算机模拟计算表明,这种方法能在有噪声干扰情况下高精度测量光纤连接器端面几何参数。