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heat, for example. The presence of this waste heat necessitates the use of thermo-electric coolers and an air-conditioned environment in order to control the device temperature, cascading the energy requirements by more than an order of magnitude.
The energy losses are mainly due to a process known as Auger recombination, a consequence of the band structure of the semiconductor materials used in making components such as semiconductor lasers and optical amplifiers. Over many years, incremental approaches have sought to reduce the consequent inefficiencies without addressing their fundamental cause. BIANCHO proposes a radical change of approach: to eliminate Auger recombination by manipulating the electronic band structure of the semiconductor materials through the use of novel dilute bismide and dilute nitride alloys of gallium arsenide and indium phosphide. This will allow the creation of more efficient and temperature tolerant photonic devices which could operate without the power-hungry cooling equipment that today’s networks demand.
CIP will be describing in more detail the technology it is developing to underpin more cost effective and greener networks at ECOC 2010 Turin in the invited paper Mo.1.B.1, “Reflective Based Active Semiconductor Components for Next Generation Optical Access Networks” and the market focus session “Mining the Wavelength Domain for Future Fibre Access: Technology and Cost Challenges” (Mass-Market Broadband Fibre Access session).
www.ciphotonics.com
Sensor Electronic Technology, Inc. pushes single chip germicidal UV LED performance to 100mW optical output power
In an ongoing development program to increase the power of ultraviolet light emitting diodes (UV LEDs) operating in the germicidal wavelength range, Sensor Electronic Technology, Inc. (SETI) has again exceeded the record for maximum optical power out of a single chip device.
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www.compoundsemiconductor.net October 2010
In December 2009, SETI reported a constant current optical output power of 30mW in the germicidal wavelength range from a large area single chip wit h an active region of 1mm2. Today, through continued development, SETI has now achieved single chip constant current performance of 100 mW in the germicidal wavelength range.
While this level of single chip performance is not yet available in SETI’s production LEDs, high power UV LED lamps are available under the UVCLEAN® trademark with germicidal powers up to 50 mW.
Recently, SETI demonstrated disinfection in an “on demand” drinking water system using 30mW LED lamps . “High power UV LEDs are essential to achieve the level of disinfection required in point- of-use and point-of-entry water treatment systems.” said Remis Gaska, President and CEO of SETI. “This ongoing development of large area high power UV LEDs will help to reduce the price per milliwatt and allow UV LEDs to enter cost sensitive disinfection markets”.
www.s-et.com
Semiconductor research gets £10 million renewal contract
A cutting-edge University of Sheffield research facility, which studies advances in semiconductors used in the internet, solar cells, DVD players and gas detection, has received a £10 million renewal contract, enabling academic experts throughout the UK to continue making technological breakthroughs.
The EPSRC National Centre for III-V Technologies, based in the University’s Centre for Nanoscience and Technology, is set to benefit from the cash over the next five years, to support research in III-V semiconductor materials and devices, which play a fundamental role in many of the technologies which transform everyday life.
Research into these semiconductors has been taking place at the University’s facility - which benefited from a University-funded £6.5 million clean room in 2006 - for 32 years. Nearly 800 scientific publications have been produced from Facility output over the last 10 years. The Facility
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