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Arabaci M.,University of Arizona | Djordjevic I.B.,University of Arizona | Saunders R.,Opnext | Marcoccia R.M.,Opnext
Optics Express | Year: 2010

In order to achieve high-speed transmission over optical transport networks (OTNs) and maximize its throughput, we propose using a rateadaptive polarization-multiplexed coded multilevel modulation with coherent detection based on component non-binary quasi-cyclic (QC) LDPC codes. Compared to prior-art bit-interleaved LDPC-coded modulation (BILDPC-CM) scheme, the proposed non-binary LDPC-coded modulation (NB-LDPC-CM) scheme not only reduces latency due to symbol- instead of bit-level processing but also provides either impressive reduction in computational complexity or striking improvements in coding gain depending on the constellation size. As the paper presents, compared to its prior-art binary counterpart, the proposed NB-LDPC-CM scheme addresses the needs of future OTNs, which are achieving the target BER performance and providing maximum possible throughput both over the entire lifetime of the OTN, better. ©2010 Optical Society of America.


Batshon H.G.,University of Arizona | Djordjevic I.,University of Arizona | Schmidt T.,Opnext
Optics Express | Year: 2010

We propose a subcarrier-multiplexed four-dimensional LDPC bit-interleaved coded modulation scheme that is capable of achieving beyond 480 Gb/s single-channel transmission rate over optical channels. Subcarrier-multiplexed four-dimensional LDPC coded modulation scheme outperforms the corresponding dual polarization schemes by up to 4.6 dB in OSNR at BER 10-8. © 2010 Optical Society of America.


Murugan G.S.,University of Southampton | Zervas M.N.,University of Southampton | Panitchob Y.,University of Southampton | Panitchob Y.,Opnext | Wilkinson J.S.,University of Southampton
Optics Letters | Year: 2011

A neodymium-doped BK7 glass microsphere laser integrated with a planar ion-exchanged waveguide pumped at 0:8 μm has been demonstrated. The pump radiation was launched by evanescent coupling from the waveguide, and the signal radiation was coupled out through the same waveguide, offering the potential for robustly assembled fully integrated active optical circuits. The dependence of the lasing spectra on pump power and wavelength were studied in detail to clarify the whispering-gallery-mode behavior at the pump and lasing wavelengths. © 2010 Optical Society of America.


Arabaci M.,University of Arizona | Djordjevic I.B.,University of Arizona | Saunders R.,Opnext | Marcoccia R.M.,Opnext
IEEE Photonics Technology Letters | Year: 2010

We propose using coded modulation based on nonbinary quasi-cyclic low-density parity-check (LDPC) codes for beyond 100-Gb/s optical transmission. The proposed scheme not only lowers the latency in the system but also offers much higher coding gains than its binary counterpart based on bit-interleaved coded modulation (BICM). We show that using component LDPC codes over high order finite fields and matching bandwidth-efficient modulations, our scheme can provide around 1-dB coding gain improvement at the bit-error ratio of 10 -6 compared to a corresponding BICM-based scheme. © 2010 IEEE.


Berger J.,Opnext
Lightwave | Year: 2011

Quad Small Form factor pluggable plus (QSFP+) transceiver modules using multimode optics have gained increasing traction in very short-reach InfiniBand applications. The largest growth area for QSFP+ continues to be in data centers where bandwidth demand continues to increase. Here, most uplinks from the switches to the cluster switch are still multimode 10GbE connections, yet, there has been some migration to 40GbE, mainly using QSFP+ modules. QSFP+ offer significant advantages over the CFP design and can combine four transmitter optical subassemblies (TOSAs) into a single integrated component. The transition from CFP to QSFP+ not only requires significant optical integration, but also power consumption reduction of the optical and electrical components. Studies have found that 40GbE transceivers in a QSFP+ form factor are poised to address both multimode and singlemode applications in a variety of market spaces.


Some of the next-generation 40/100 Gigabit Ethernet transceiver technologies and designs are reviewed. The first-generation 40GBase-LR4 optical transceiver is based on a 4×10G architecture that comprises 10G CWDM 1310-nm uncooled directly modulated distributed feedback (DM-DFB) transmit optical subassemblies (TOSA). The CFP 40GBase module power dissipation is typically in the range of 6W, which fits well within the CFP module's 32-W power maximum. CFP 100GBase-LR4/ER4 is similar to the CFP 40GBase transceiver. A 10:4/4:10 gearbox serializer/deserializer IC is used to implement the electrical interface between the 10-lane host data path and the four lane optical data path. The receiver optical specifications for LR4 and ER4 are based upon PIN-PD detector technology with integrated TIA. First generation 40GbE/100GbE CFP optical transceivers are now completing customer qualification.


Anderson J.,Opnext | Traverso M.,Opnext
IEEE Communications Magazine | Year: 2010

A new generation of optical transceivers for 100 Gigabit Ethernet client interconnection and line system transmission are now being developed and deployed for data center and transport applications. This article provides an overview and status of the 100 G Form-factor Pluggable Multi-Source Agreement for client applications and the Optical Internetworking Forum 100 G Transponder Module Implementation Agreement for long distance DWDM transmission applications. © 2010 IEEE.


News Article | December 19, 2016
Site: www.marketwired.com

(Salem, New Hampshire, December 19, 2016) ProPhotonix Limited (OTC: STKR and London Stock Exchange - AIM: PPIX and PPIR), a high technology designer and manufacturer of LED illumination systems and laser diode modules, with operations in Ireland and the United Kingdom, today announces that its results for the year ending 31 December 2016 are expected to be ahead of market expectations with revenue forecast to be approximately $16.0 million and operating income of approximately $1.3 million. Tim Losik, CEO of ProPhotonix, stated - "Revenue for the year ending 31 December 2016 is expected to increase by approximately 11% over the 2015 comparable figure and operating income is expected to increase by approximately 65% over the 2015 comparable figure. The revenue growth stems from continuing customer development activity and significant revenue from two customers. Operating income growth comes from improved revenue mix, volume and cost containment. "We have experienced strong revenue from two customers in 2016 contributing approximately 20% of the total revenue. At present, these two customers are expected to continue contributing strong revenue in the first half of 2017, but we anticipate the run rate to decline during the second half of 2017 as the 2016 run rate is exceptional. There are sufficient new opportunities in our business pipeline which give us reasonable confidence to offset any potential decline from these accounts and to continue to grow our business in 2017." The Directors expect that the Company's unaudited preliminary results will be released by the end of March 2017 and the final audited results will be published by the end of April 2017. About ProPhotonix ProPhotonix Limited, headquartered in Salem, New Hampshire, is a high technology designer and manufacturer of LED illumination systems and laser diode modules for industry leading  OEMs and medical equipment companies. In addition, the Company distributes premium  diodes for Ushio (formerly Opnext), Osram, QSI, Panasonic, and Sony. The Company serves a wide range of markets including the machine vision, industrial inspection, security, and  medical markets. ProPhotonix has offices and subsidiaries in the U.S., Ireland, U.K., and  Europe. For more information about ProPhotonix and its innovative products, visit the  Company's web site at www.prophotonix.com. Cautionary Statement This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements other than statements of historical fact, including without limitation, those with respect to ProPhotonix's goals, plans and strategies set forth herein are forward-looking statements. The following important factors and uncertainties, among others, could cause actual results to differ materially from those described in these forward-looking statements: uncertainty that cash balances may not be sufficient to allow ProPhotonix to meet all of its business goals; uncertainty that ProPhotonix's new products will gain market acceptance; the risk that delays and unanticipated expenses in developing new products could delay the commercial release of those products and affect revenue estimates; the risk that one of our competitors could develop and bring to market a technology that is superior to those products that we are currently developing; and ProPhotonix's ability to capitalize on its significant research and development efforts by successfully marketing those products that the Company develops. Forward-looking statements represent management's current expectations and are inherently uncertain. All Company, brand, and product names are trademarks or registered trademarks of their respective holders. ProPhotonix undertakes no duty to update any of these forward-looking statements. ###### This information is provided by RNS The company news service from the London Stock Exchange


News Article | December 6, 2016
Site: www.marketwired.com

SALEM, NH--(Marketwired - Dec 6, 2016) - ProPhotonix Limited ( : STKR) ( : PPIX) ( : PPIX), a high technology designer and manufacturer of LED illumination systems and laser diode modules, with operations in Ireland and the United Kingdom, today announces the expansion of its European sales organization with three new Regional Sales Manager appointments. Ad Fens takes over responsibility for sales in Benelux and North Western Germany. He has 30+ years' sales management and business development experience, most recently as European sales manager with Dr. Hönle AG selling UV equipment to end users in the coatings, adhesives and printing industries. Michael Witte has 10+ years' experience in both technical and sales management roles, most recently with LAP GmbH Lasers where he was responsible for product and sales management of laser systems into industrial and medical applications. He assumes responsibility for the Nordics, North and East Germany and the Baltics. Michael Roessler joins from Keyence where he was a senior sales manager. He has 15+ years' sales and business development experience and will cover Southern Germany, Austria and Switzerland. "We are extremely pleased to welcome these three talented individuals to the ProPhotonix team each of whom brings a variety of valuable experience in the fields of lasers, LEDs, UV and OEM sales," commented David McGuinness, Director of Sales - EMEA. Tim Losik, CEO of ProPhotonix, stated - "Expanding our European sales team is a significant investment in our future revenue growth. We operate as a lean, cost conscious organization and expect this initiative will provide deep regional sales coverage and growing revenue from the second half of 2017 and beyond. Our intention is to also expand the North American sales team in the first half of 2017." About ProPhotonix ProPhotonix Limited, headquartered in Salem, New Hampshire, is a high technology designer and manufacturer of LED illumination systems and laser diode modules for industry leading OEMs and medical equipment companies. In addition, the Company distributes premium diodes for Ushio (formerly Opnext), Osram, QSI, Panasonic, and Sony. The Company serves a wide range of markets including the machine vision, industrial inspection, security, and medical markets. ProPhotonix has offices and subsidiaries in the U.S., Ireland, U.K., and Europe. For more information about ProPhotonix and its innovative products, visit the Company's web site at www.prophotonix.com. This information is provided by RNS The company news service from the London Stock Exchange

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