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approach that circumvents this limitation, resulting in a collection efficiency of 6 % into a single-mode optical fibre, with broadband spectral operation over tens of nanometres. Each quantum dot is embedded in a suspended GaAs channel waveguide with a width and thickness of about 200 nm and a length of a few micrometres.
Rather than collecting the small amount of emission from a selected quantum dot that escapes this waveguide vertically into free-space, an optical fibre taper waveguide captures some of the larger fraction of that quantum dot’s emission which is trapped in the semiconductor. The taper waveguide is a standard 125 µm-diameter, single mode optical fibre that is gradually tapered to a diameter of about 1 µm along an approximately 1 cm-long section.
The two waveguides form a directional coupler, a common device used in lightwave systems to transfer power between adjacent waveguides through evanescent coupling. Photon correlation measurements confirm the single photon nature of the out-coupled quantum dot emission. By using single mode optical fibres typical to lightwave systems, the new technique is designed to be compatible with many quantum information processing applications. Finally, detailed simulations predict that the collection efficiency can be improved by an additional factor of 5 if the location of the quantum dot can be precisely controlled.
Further details of this work have been published in the paper, “Efficient quantum dot single photon extraction into an optical fiber using a nanophotonic directional coupler” by Davanço et al, Applied Physics Letters, 99, 121101 (2011).
NeoPhotonics bags Huawei Golden Supplier Award
At the Core Partner Convention, the firm was honoured for its modules for high speed 40G and 100G systems.
NeoPhotonics Corporation, a designer and manufacturer of photonic integrated circuit (PIC), based modules and subsystems for bandwidth- intensive, high speed communications networks, has received the prestigious Golden Award as an
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www.compoundsemiconductor.net November/December 2011
Excellent Core Partner from Huawei Technologies, a leading provider of telecommunications network solutions.
At an awards ceremony at Huawei›s corporate headquarters in Shenzhen, NeoPhotonics was honoured for its contributions as a supplier of innovative technology, plus high-quality and on- time delivery of its optical products for high-speed, agile and access communications networks. NeoPhotonics Chairman and CEO Tim Jenks attended the event.
Of the more than one thousand suppliers that Huawei works with each year, the award is given only to companies that consistently deliver the highest performance and quality products that meet Huawei›s highly specialized requirements. Out of 30 vendors of optical products, Huawei selected six as Core Partners, and, out of the six, four, including NeoPhotonics, were given the Golden Award for supplier excellence. This is the third time that NeoPhotonics has been recognised as a Huawei Core Partner.
«We are honoured that Huawei chose NeoPhotonics to win this prestigious Supplier Award,» said Tim Jenks, CEO of NeoPhotonics. «We are proud that NeoPhotonics has been integral to the success of Huawei, just as Huawei has been pivotal to the success of NeoPhotonics. We believe that we provide the highest value to our customers by not only delivering high-performance and high- quality products, but also by working seamlessly with our customers, leveraging our engineering strength, supply chain systems, and collaborative working relationships to anticipate their needs. This recognition by Huawei is a testament to the high quality products and volume manufacturing capabilities of NeoPhotonics.»
TeliaSonera uses Infinera’s InP PICs to break barriers
The firms have successfully completed, what they say, is the world’s first Terabit optical transmission based on 500 Gigabit per second (Gb/s) super- channels using indium phosphide based devices.
The demonstration spanned 1,105 kilometres of fibre between Los Angeles and San Jose,
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