低延迟失真光纤带光缆的研制

研究发现导致12芯光纤带延迟失真的原因有光纤带中各光纤的折射率差、光纤矩阵排列的错位以及光纤中的残余应力，为此开发出一种低延迟失真的新型12芯光纤带，其单模光纤带的延迟失真达0．259ps／m，多模光纤带的延迟失真达0．375ps／m。采用此光纤带研制的288芯骨架槽结构的单模光纤带光缆的延迟失真仅为0．520ps／m。     

Design and performance of nonmetallic optical fiber cable with high-impact-resistant sheath

A nonmetallic optical fiber cable which contains fiber ribbons inserted into slots is proposed. The cable has a high-impact-resistant sheath which affords protection against shotgun pellets. The antiballistic performance and cable diameter are investigated experimentally, and an optimum combination of thicknesses for the protective layer and outer polyethylene sheath is obtained. Based on the results, a nonmetallic 100-fiber cable with a high-strength protective sheath was manufactured, and its performance was evaluated. Excellent transmission, mechanical, and antiballistic characteristics were confirmed.<>     

Integrated Transducer Modules, Connectors and Cable for Industrial Fiber Optic Data Links

Integrated, TTL compatible, point-to-point fiber optic data links have been developed to accommodate arbitrary data formats and provide data transmission over 1-1000 m at 0-15 Mbit/s NRZ data rate with fiber/cable having a bandwidth ≥25 MHz.km. The compact, low profile (0.79 cm) printed circuit board mountable, transmit and receive modules operate from a single +5 V supply and provide automatic link monitoring to simplify interfacing. Single fiber connectors of the ferrule type are described. They achieve attenuation ≤ 2.0 dB and are cost effective and easily installable. The connectors are mechanically terminated to reinforced single fiber cable to withstand a pull force ≥ 150N and multiple makes and breaks.     

Subscriber single-mode optical fiber ribbon cable technologiessuitable for midspan access

The loop network configuration and high-fiber-count, single-mode optical fiber ribbon cable and jointing technologies which enable a quick response to service demand and offer high reliability in the subscriber network are described. Fiber parameters were chosen for 1.3/1.55-μm wavelength division multiplexing (WDM) transmission, and a 1000-fiber cable composed of 8-fiber ribbons was developed. A mass-fusion splicing technique and a multifiber connector were developed for the fiber ribbon. These techniques were evaluated by constructing an experimental line. It was found that they are highly suitable for midspan access, which is indispensable for the high-fiber-count loop network     

Near hexagonal close-packed optical fiber array for parallel optical interconnection

In conventional optical fiber based two-dimensional (2-D) parallel optical interconnection (POI), optical fiber arrays are aligned to 2-D light sources and detectors using precisely fabricated hole-plate or stacked V-groove plates. All these structures have problems in making positioning components and assembly with high accuracy. For polymer optical fibers with large diameter, the whole dimension of the array will be too large if they are positioned using V-grooves or hole-plate. This paper proposes a 2-D near hexagonal close-packed (NHCP) optical fiber array for 2-D POI. NHCP array has a cross-sectional profile of near-hexagonal lattice and with fibers precisely positioned at each node of lattice. Compared with perfect HCP lattice, NHCP lattice is slightly stretched in one dimension and still have all fibers with nonuniform diameter packed tightly with high packing fraction. The position of fibers in NHCP array is very important when aligned to 2-D light sources and detectors. This paper deduce the analytically expression for the probability distribution of fiber position which is related to variance of fiber diameter and structure parameters of NHCP array, and verified it by computer simulation. Experiment samples of NHCP array have been made showing that NHCP array is easy to be fabricated.     

Low-rigidity optical fiber ribbon and its application to ultra-high-density cable with bending-loss insensitive fibers

We propose a novel optical fiber ribbon using bending-loss insensitive fibers aimed at tightly and randomly assembling in small core of the cable. Proposed ribbon is designed to be capable of mass-splicing and to suppress local bending and strain increase caused by cabling and cable bending by reducing flexural rigidity against bending under high fiber density assembling. We manufactured the cable with proposed ribbons and achieve the maximum fiber density of a 4.1 fiber/mm² for 400-fiber cable in conjunction with good optical loss and strain characteristics.     

Precision Molding of Polymeric Multi‐Channel Optical Interconnection Devices Considering the Coefficient of Thermal Expansion of the Materials

Polymeric multi‐channel optical interconnection devices that are usually fabricated by transfer molding are indispensable for parallel interconnection in high speed, high capacity optical communication systems. This paper proposes a design technique considering the thermal behavior of materials, such as shrinkage and expansion during the molding process, to satisfy geometrical requirements that have less than 1 μm tolerance. We also designed molds considering the thermal effects of the materials and fabricated multichannel optical fiber connectors that have less than 1 μm tolerance.     

FMS—1光纤固定连接器在单模光缆线路上的应用

本文介绍ＦＭＳ—１型光纤固定连接器在四条单模光缆线路中现场接续情况。四条光缆线路共用１５４只接头，平均接续损耗０．１２５ｄＢ，每根光纤的平均接头损耗≤０．１５ｄＢ。最长接续巨离３３ｋｍ。文中还对青阳至九华山段测量了全部接头的回波损耗，测量结果表明回波损耗大于３８ｄＢ。     

90° Light Beam Deflection Technology for Single-Mode Optical Interconnection Systems

In this letter, we demonstrate an extremely low loss (<0.06 dB) 1-mm bending radius 90deg light deflection by using a 12-single-mode-fiber ribbon for optical interconnection systems. This technology is easy to be adopted for optical surface mount assemblies that need light beam deflection between the vertical surface-emitting lasers or surface-receiving photodiodes and optical paths parallel to an electric circuit board. We have chosen single-mode fiber (SMF) for the 90deg-bent fiber expecting the single-mode transmission will be applied for high-performance optical interconnection systems because of its wide bandwidth and stability in transmission characteristics. In order to minimize the bending loss and accomplish a small bending radius, we have developed a new optical fiber having higher refractive index of the core (high delta n fiber) than that of conventional fiber and 80-mum-cladding 125-mum spacing 12-fiber ribbon for dense packaging and easy handling in narrow spaces. It is bent at a radius of 1 mm by heating process with a ceramic heater.     

Technology development of a high-density 32-channel 16-Gb/s opticaldata link for optical interconnection applications for theoptoelectronic technology consortium (OETC)

A parallel, 32-channel, high density (140 μm pitch), 500 Mb/s NRZ, point-to-point, optical data link has been fabricated using existing GaAs IC, silicon optical bench (SiOB), and multichip module (MCM-D) technologies. The main components of the transmitter and the receiver modules are a GaAs-based vertical cavity surface emitting laser (VCSEL) array at 850 mn with its IC driver array chip and an integrated metal-semiconductor-metal (MSM) receiver (photodetector and signal processing circuits) array at 850 nm. The package module uses a modified 164 I/O JEDEC premolded plastic quad flat pack (PQFP) in combination with a polymer film integrated circuit (POLYFIC) chip carrier. The electrical input and output are 500 Mb/s NRZ binary signals. The optical I/O in both modules consists of a directly-connectorized (nonpigtail) fiber array block that plugs into the 32×1 optical fiber ribbon directly on one side and accepts 32 optical signals from the SEL array or delivers them to the MSM receiver array via a gold-coated 45° polished fiber array mirror. The MACII-32 ribbon cable is an enhanced version of the standard MACII connector ribbon cable. This paper characterizes key components of the optical data link, describes its package design, and discusses preliminary component and optical data link test results     

基于垂直腔面发射激光器的高速率并行光发射模块

报道了关于并行光发射模块的设计与制作.优化设计、制作并测试了12信道并行光发射模块,单信道传输速率可达3Gbit/s.采用波长为850nm的垂直腔面发射激光器作光源,激光器与驱动电路芯片直接用金丝连接.输出光束直接耦合进入12信道的光纤阵列中.采用小型化可插拔封装结构以便在应用中实现热插拔.模块的测试结果表明,在8mA的工作电流下,测到3Gbit/s的清晰眼图.     

Optical subscriber cable technologies in Japan

An overview is given of recent development of subscriber optical cable technologies in Japan. Technologies for constructing a star network using high count fiber cable have been developed. The effect of this development on the cable distribution system, fiber selection, cable structure, splices and connectors, and closure and measurement technology is described. Field trials and features of these technologies are also reviewed.     

中国光纤通信网的发展及市场

９０年代以来,中国电信事业发展迅速,成就卓然。文中阐述了光缆建设,光缆通信设备建设,光纤传输网体系及全光网发展的前景,并对光缆,光纤,ＳＤＨ设备及光连接器等市场进行了估测。     

First measurement of strain distribution along field-installedoptical fibers using Brillouin spectroscopy

Strain distributions along optical fibers in a 1.3-km-long cable before and after installation are measured using Brillouin optical-fiber time domain analysis. The residual strains in the installed optical fibers were found to vary from zero to 0.07%, depending on the conduit configuration and installation procedure. Strain distribution measurements were carried out on a 24-fiber slotted-core type single-mode optical fiber cable for 1.55-μm-wavelength transmission, whose length, outer diameter, and weight were 1.3 km, 14 mm, and 0.18 kg/m, respectively. No clear relation between strain distributions and the fiber configuration in the test cable are found     

Optical Transmission for Interoffice Trunks

There is general agreement among members of the engineering community that the interoffice telephone trunk is a prime candidate for commercial application of fiber optical systems. Field performance, in terms of endurance in a working telephone environment, remains as one of the few questions to be answered. A fiber optic transmission system was installed between two telephone central offices to demonstrate the performance of a practical system. The installed system uses Burrus Type LED sources and APD detectors. Most of the ancillary equipment uses conventional electronics. This paper describes the operation, considers the similarities between optical and metallic transmission requirements and discusses the method of route selection. The installation of fiber optic cable in existing underground ducts will be covered as well. Hand tools for fiber splicing developed specifically for field applications, will be described and their use will be discussed. Features characteristic to optical transmission will be accentuated.     

Direct current to 34.1-Gb/s, 19-Gb/s/cm/sup 3/ low-jitter parallel optical interconnecting module for high-speed memory test systems

A protocol-free parallel optical interconnecting module is introduced as a solution to solve memory test system transmission bottlenecks. The optical transmission system flexibly suited for a memory test system is reviewed and discussed. A parallel optical module capable of transmitting from dc to 34.1Gb/s (4.267 Gb/s /spl times/8 ch) has been developed. A data transmission throughput density per unit volume of 19 Gb/s/cm/sup 3/ is achieved. A random jitter of less than 3-ps root-mean-square is also achieved. Furthermore, high-density optical connector, high-density optical fiber cable, fiber guides, and cable management/reinforcement members suited for mechanical requirements of the memory test system have been developed.     

浅谈1200芯骨架式光纤带光缆的研制及应用

随着我国光通信行业的发展,光纤光缆的制造技术业也得到了长足的发展,尤其是光纤带光缆,凭借其光纤密集度高外径小而广泛应用。本文重点介绍了1200芯骨架式光纤带光缆的结构设计原理、原材料的使用、关键制造工艺要点及应用,并给出了其性能测试结果,给超大芯数高密度光缆研发提供了积极意义。     

Subscriber optical fiber cable transfer splicing system usingmechanically transferable connectors

An optical fiber cable transfer splicing system is developed for use in removing or changing optical fiber cables. The system enables rapid transfer from existing optical fiber cables to newly installed ones. The transfer is carried out synchronously using two mechanically transferable connectors which terminate the optical fiber cables at two different points, such as manholes. Before the transfer splicing, the system identifies a fiber ribbon in order to avoid mistransfer. A transfer time of less than 30 ms was achieved. The fiber ribbon was identified with a loss, from an identification light source to an identification point, of 35.5 dB. With this system, cable transfer can be faultlessly carried out with only a slight interruption to working transmission systems and circuit quality degradation is suppressed     

Performance comparison of small form factor fiber optic connectors

A comparison of small form factor (SFF) fiber optic connectors is presented for LC, MT-RJ, SC-DC, and VF-45. Multimode jumper cables were tested using industry standard test procedures and bench marked against the industry standard SC Duplex connector. Initial loss data as well as stress testing was performed. Variations were found in the performance of the connectors types and between connectors of the same type from different suppliers. In some cases the connectors out performed the SC Duplex on some tests but no connectors out performed the SC Duplex on all tests with the mechanical stress tests of axial and off-axial pull being the most difficult to exceed. These connectors are rapidly developing and are at different levels of maturity but none of them tested out to be a fully mature replacement for the SC Duplex connector yet     

基于STM-64的甚短距离并行光传输系统

研究了STM-64数据帧的转换映射技术,利用垂直腔面发射激光器（VCSEL）列阵光源和PIN列阵探测器成功研制出10Gb／s的甚短距离12信道SDH并行光传输系统,该系统结构紧凑,具有检错和纠错功能。跟传统的10Gb/s串行光传输系统相比,本系统降低了对单路器件传输性能的要求。经SDH传输测试仪测试,系统能实现无误传输。