news digest ♦ Lasers
The assets to be sold include fixed assets, inventory and intellectual property for the VCSEL-based product lines within Emcore’s fibre optics business unit. These product lines include VCSEL and photodiode components, parallel optical transceiver modules, and active optical cables.
Emcore will retain its Telecom and Broadband fibre optics products that include its market leading tuneable lasers, tuneable XFPs, cable TV modules and transmitters, FTTx transceivers, InP-based lasers, photodiodes, and modulators, video transport and specialty photonics products.
The sale of the VCSEL product line allows Emcore to focus its fibre optics product portfolio in areas of strong product differentiation. In fiscal year 2011, the VCSEL-based product lines contributed approximately 5 % of Emcore’s overall revenue.
Emcore says the sale of the VCSEL-based product should simplify the firm’s operating structure, reduce fixed costs, and improve market focus. Emcore’s core competencies in compound semiconductor-based products and performance capabilities remain the cornerstones of its Fibre Optics business, addressing high-speed fibre optic transmission for telecom, broadband, and military and defence applications.
“The decision to sell the VCSEL-based product lines is strategic and market driven,” comments Hong Hou, Emcore’s Chief Executive Officer. “Our product and technology portfolio is strongly aligned to support current and future requirements in tuneable, coherent high-speed transmission systems and next- generation broadband architectures.”
“The proceeds from the transaction significantly improve our balance sheet and the sale is expected to reduce the time to reaching profitability. Along with the improved operating model, the transaction will benefit our customers as we focus our investment in telecom, broadband and specialty photonics products to remain industry leaders in those respective product lines in our fibre optic business segment”, concludes Hou.
The transaction is expected to close shortly after securing regulatory approval by the Committee on Foreign Investment in the United States (“CFIUS”).
NTT Photonics chooses Aixtron reactor to develop lasers
The Japanese firm will use the MOCVD tool for indium gallium arsenide phosphide research
Japanese firm NTT Photonics has placed an order for an Aixtron CCS reactor MOCVD system for InGaAsP quaternary diode laser research.
Ordered in the second quarter of 2011, the reactor will be delivered in the first quarter of 2012.
A local Aixtron service support team will install the reactor at 132
www.compoundsemiconductor.net April/May 2012
the NTT Photonics Device Laboratory in Atsugi, Kanagawa Prefecture, Japan.
Aixtron says its CCS MOCVD reactor has set new standards in laboratories and companies worldwide.
The new reactor for NTT Photonics will come with several special features including an EpiCurveTT, ARGUS, Gap Adjustment and the Epison 4 in-line gas concentration monitor.
These tools monitor the growth of the epiwafers and provide vital information for future growths .
For NTT Photonics, another important factor was the excellent Group V efficiency of the CCS reactor contributing to significantly lower operating costs.
Able to deliver very challenging MOCVD applications, the Aixtron CCS reactor has very good process flexibility thanks to the Showerhead concept and uniform flow distribution. Combined with gap adjustment and ARGUS in-situ monitoring for temperature mapping of the entire susceptor, it is suitable for research and development of high-end devices such as InGaAsP quaternary diode lasers.
Nitride sensors can cope with high temperatures and
harmful radiation Scientists have developed Hall effect gallium nitride based magnetic field sensors which can be used in space crafts and nuclear power stations
Toyohashi Tech researchers have fabricated Hall effect magnetic field sensors which can operate above 400oC.
Under extreme radiation conditions, the gallium nitride-based heterostructures operate with a two-dimensional electron gas.
Silicon and III-V compound semiconductor Hall effect magnetic field sensors are widely used in the electronics industry for monitoring rotation in equipment such as optical memory disks and for banknote authentication in vending machines.
However, the use of Hall sensors for monitoring magnetic fields in outer space and nuclear power stations is more challenging. This is due to large fluctuations in temperature and harmful radiation in these environments. To resolve these issues, the Toyohashi Tech researchers used AlGaN/GaN two-dimensional electron gas heterostructures to fabricate high sensitivity micro-Hall effect magnetic field sensors that are stable at high temperatures and high fluxes of proton irradiation.
They used micro-Hall sensors based on AlGaN/GaN. These devices were stable up to at least 400 oC, whereas sensors fabricated using GaAs and InSb degraded from about 120 oC.
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