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【期刊论文】Design and implementation of a broadband optical rotary joint using C-lenses
井文才, Wencai Jing, Dagong Jia, Feng Tang, Hongxia Zhang, Yimo Zhang, Ge Zhou, Jinlong Yu, Fanmin Kong, and Kun Liu
23 August 2004/Vol. 12, No.17/OPTICS EXPRESS ,-0001,():
-1年11月30日
A broadband optical rotary joint (BORJ) was designed using Clenses. Its insertion loss was less than 2 dB at both the 1300nm and 1550nm wavelength windows. Wavelength division multiplexing (WDM) technique was adopted to increase the number of data transmission channels. Hundreds of wavelength channels can be accommodated for data transmission through relatively rotating interfaces using this BORJ. The total data transmission rate through this BORJ can be more than 200 Gbit/s. By using Dove prism, both space division multiplexing (SDM) and WDM techniques can be implemented simultaneously in the design of BORJ with C-lenses. This structure of BORJ has a low cost. It can be used for optical data transmission and optical sensing.
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【期刊论文】Design of a multichannel ring network with tunable laser diodes and fixed optical detectors
井文才, Wencai Jing, Yi-Mo Zhang, Ge Zhou
Optical Engineering. Vol. 42, No.8, August 2003,-0001,():
-1年11月30日
A multichannel ring is designed. Each sublayer network is connected to the ring with an access node (AN). which can transmit data at every wavelength with a tunable laser diode The data transmission speed at each wavelength is 1.25 Gbit/s. With eight waverengths, a total bandwidth of 10 Gbit/s can be obtained. With a bandpass filter, the desired optical signal can be dropped down at the access node. On receiving a data packet, the optical signal is split into two parts One part is converted to an electrical signal and its destination address is extracted and verified, if the data packet belongs to the local subnetwork, it is received. Otherwise, it is retransmitted to the next access node with a selected wavelength. So pipelining data transmission can be achieved among different wavelengths And this nelwork is a multipipelie structure. The data processing time is less than 3OO ns, and all of the pro cessing procedure is implemented via a field programmable gate array (FPGA). So the communication latency and communication overheads can be decreased. Meanwhile, the ring topology has good eatabillity More wavelengths can be adopted for a large-scale network with more access nodes.
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井文才, Wencai Jing, Yimo Zhang, Ge Zhou and Feng Tang
Meas. Sci. Technol. 14(2003)294-300 ,-0001,():
-1年11月30日
distributed polarization coupling in high birefringence fibres. Detailed theoretical analysis of the measurement accuracy of the testing system is presented. The main part is a Michelson interferometer with a scanning arm driven by a stepping motor. The minimum polarization coupling intensity detectable by this system is-77 dB. The maximum fibre length that can be tested under this design is more than 1 km, and the spatial resolution is better than 50mm. The influence of the opto-electro-mechanical devices on measurement accuracy has been analysed in order to improve the performance-to-cost ratio. This testing system can also be used in coherence division multiplexing optical fibre sensors.
white light interferometry,, Michelson interferometer,, polarization coupling intensity,, spatial resolution,, coherence division multiplexing
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【期刊论文】Design and analysis of the communication protocol for TSOINet
井文才, Wencai Jing, Jindong Tian, Ge Zhou, Yimo Zhang, Wei Liu, Haifeng Ei, Nan Zhang
,-0001,():
-1年11月30日
In this paper, a communication protocol has been designed for the two-layer scalable optical interconnectinn network (TgOlNet) designed in Tianjin University. The communication protocol has been designed based on TCP/IP (transmission control protocol/intemet protocol) protocol. But it is more efficient than TCP/IP for data Iransmissinn in TSOINet. An auxiliary channel has been introduced in TSOINet for transmission of the commtmicatinn status messages among the sub-layer rings. Many network management functions, such as flow control, hand shaking, etc., can be achieved via the auxiliary chalmel, so the commtmication overheads can be decreased. The performance of the corrtmunication protocol has been evaluated compared to TCP/IP protocol for data transmission in TSOINet.
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【期刊论文】Design and Implementation of a Virtual Multi-channel Optical Ring*
井文才, JING Wencai, ZHOU Ge, ZHANG Yimo, LI Haifeng, ZHANG Hongxia
CHINESE JOURNAL OF LASERS Vol. B10, No.6, December, 2001,-0001,():
-1年11月30日
The hardware and the communication protocol of a scalable optical ring have been designed. A hardware routing has been achieved on the network interface card to minimize data packet communication latency and a simplified communication protocol has been designed to reduce communication overheads. To reduce the data packet bilking probability and have a more efficient usage of the data link layer bandwidth, a virtual multi-channel transmission mechanism has been achieved. The network supports a maximum of 16 virtual channels for each physical data link. Time slots can be dynamically assigned to each virtual channel. Zero wait time has been achieved for the switching between different virtual channels.
communication protocol,, scalable optical ring,, hardware routing,, virtual muhi-channel transmission,, time slot
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