Opnext Inc. (NASDAQ:OPXT) says it has demonstrated a single-wavelength, real-time coherent 127G PM-QPSK (polarization multiplexed quadrature phase-shift keying) modem on the TeliaSonera network running through Sweden. The TeliaSonera trial represents the first real-time, single-wavelength 100G field trial in Europe, Opnext asserts.
Opnext can make the claim because the first generation of Ciena’s (ex-Nortel) PM-QPSK 100G technology isn’t single-wavelength.
The trial conducted over a long-haul link with 10-Gbps and 40-Gbps mixed traffic ran from Uppsala to Olofström in Sweden and back for[......]
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Avago Technologies (NASDAQ: AVGO), Finisar Corp. (NASDAQ: FNSR), Opnext Inc. (NASDAQ: OPXT), and Sumitomo Electric Industries, Ltd. have announced Revision 1.4 of the CFP Multi-Source Agreement (MSA) hardware and firmware specification documents.
In addition, the latter three companies, which founded the CFP MSA, have welcomed Avago Technologies as a new member. Other manufacturer companies interested in joining the CFP MSA are encouraged to contact an existing MSA representative, the companies say.
The purpose of the CFP MSA is to define a hot-pluggable optical transceiver form factor [......]
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The city-state of Singapore is one of the wealthiest and most densely-populated nations in the world. Its MRT rail network forms the backbone of the city’s public transport system. The government is currently expanding the network through the introduction of the Circle Line (CCL), a fully-underground orbital line connecting all the MRT routes into the city, at a cost of US$6.7 billion.
Set for completion in 2010, CCL will be 33.3 km long with 29 stations. Its purpose is to cut traveling time by enabling commuters to bypass busy interchanges.
The primary goal of the Land Transport[......]
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Optical Zonu Corp. has introduced the OZ1600 Ultra Broadband Fiber Optic Transceiver for RF over fiber-optics links. The new transceiver is designed for operation up to 7 GHz with exceptionally flat frequency response. It is packaged in a rugged dust-tight cast metal housing with optional integral WDM for duplex transmission on one SMF-28 singlemode fiber.
Optical Zonu says key attributes of the new product include:
- operation from 20 MHz to 7 GHz
- high SFDR, which provides “excellent noise performance and high linearity”
- very stable gain
- flat frequency response
- extended temperature range[......]
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According to a newly published report by market research firm Dell’Oro Group, first quarter 2010 GPON equipment revenues from both optical line terminals and optical networking terminals surpassed EPON revenues for the first time and hit a record level, growing almost 40 percent sequentially and 70 percent over the year ago period.
“GPON growth in the first quarter was largely due to deployments in China,” said Tam Dell’Oro, president of Dell’Oro Group. “China Unicom and China Telecom are deploying both EPON and GPON. China Mobile, which was recently granted permission to deploy broadband and[......]
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VOSCOM TECHNOLOGIES, the leading supplier of advanced digital video fiber transmission products, has launched its second generation drop and insert fiber optic transmission system,VOS-DC400, at the IFSEC2010, which is held on May 10 to 13th in Birmingham, UK.
The new VOS-DC400 series utilizes digitally encoded technology and can implement multimode video input via one single mode fiber. A single fiber link can transmit up to 16 video channels, and the remote node video input module can transmit one to eight video channels. Every node can be configured for multichannel audio, RS-422/RS-4[......]
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Fibre optics for CCTV applications are predominantly used in extended local installations linking cameras back to monitors with dedicated fibres for each link. A typical optical system layout is shown in bellow.
This example illustrates the main features of any fibre optic converter system, which are as follows:
1. The fibre optic link and its associated terminal equipment fit between the camera and the associated monitor/controller and provide a transparent signal path i.e. the camera and controller do not know that the signals have been transmitted over fibre.
2. The camera output is a 1V pe[......]
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Fiber Optic CableMay 27th, 2010admin
Fibers that carry more than one mode are called multi-mode fibers. There are two types of multi-mode fibers. One type is step-index multi-mode fiber and the other type is graded-index multi-mode fiber.
The following illustration shows the differences between these two types of multimode fibers on refractive index profile and how they guide light.
Fiber Optic Transmission in a Step-Index Multimode Fiber and a Graded-Index Multimode Fiber
Step-index multimode fibers are mostly used for imaging and illumination. Graded-index multimode fibers are used for data communications and ne[......]
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Fiber Optic CableMay 24th, 2010admin
As the core of the fiber is so small that one ray of light at an angle of 0 ° incident can stably pass through the fiber length, without much loss, this type of fiber called single-mode optical fiber. The basic requirement for single-mode fiber is that the basic limit small enough to transfer to a mode of singing. This lowest order mode can propagate in all fibers with small cores (as long as light can be physically fibers).
The most common type of single mode fiber has a base diameter of 8-10 mu m and is designed for use in the near infrared (the most common are designed 1550nm and 13[......]
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Hospital operating rooms in cinemas, Traffic Control Center to become high quality video is ubiquitous, and in a growing number of demanding applications, optical fiber cables, such as the distribution vehicle choice.
IP networks and opportunities for content distribution on Cat-5 and other simple, low cost cabling, have been much attention in recent years. However, more and more users and developers and integrators that are used these days to decide that the benefits of fiber can not simply be denied.
And even as businesses in the commercial, industrial, governmental and educational s[......]
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