Showing posts with label Modulation. Show all posts
Showing posts with label Modulation. Show all posts

Wednesday, October 12, 2016

Nokia Bell Labs Achieves 65 Tbps for Transoceanic Cable Systems

Alcatel-Lucent Submarine Networks (ASN) and Nokia Bell Labs have achieved record transmission capacity over a 6,600 km single mode fiber.

The lab trial demonstrated a total 65 Tbps transmission using submarine grade dual band erbium doped fiber amplifiers, which will help extend the capability of transoceanic cable systems to meet increasing data traffic demand. The trial leveraged Bell Labs' new Probabilistic Constellation Shaping (PCS) technology, a new modulation technique that maximizes the distance and capacity of high-speed transmission in optical networks. Unlike traditional techniques whereby all constellation symbols are transmitted with the same occurrence, PCS intelligently uses non-uniform transmission of constellation symbols by reducing the occurrence of high power symbols, thus providing more resilience to noise and other impairments, and the ability to dynamically adapt to changing conditions.

"The future digital existence where everyone, everything and every system and process is connected will require a massive increase in network capacity and the ability to dynamically optimize this capacity. Probabilistic Constellation Shaping extends the limits of current optical transmission by utilizing novel modulation techniques to dramatically improve the performance and capacity needed for the new digital era that will be enabled by the Future X Network," stated Marcus Weldon, president of Nokia Bell Labs & Nokia CTO.

http://www.nokia.com

Monday, January 18, 2016

Telstra Tests Infinera's Advanced Coherent Toolkit on 9,000km Cable

Telstra has validated Infinera's Advanced Coherent Toolkit (ACT) for super-channels.

This new technology will cover the Telstra Endeavour subsea cable stretching 9,000 kilometers between Sydney, Australia and Oahu, Hawaii and extract the maximum capacity from subsea and long haul terrestrial cable systems carrying super-channels -- whether for new large area fibers or existing cables.


In trials on a range of next-generation super-channel coherent modulation technologies conducted late last year, two unique super-channel based capabilities were successfully demonstrated in the trial -- Nyquist subcarriers and Soft Decision Forward Error Correction (SD-FEC) gain sharing.

Infinera said the trial validated the benefit of Nyquist subcarriers that have been shown in other studies to offer around a 20 percent increase in reach compared to single carrier transmission. In addition, the trial validated SD-FEC gain sharing in which carriers with the highest performance can be paired with carriers with lower Optical Signal to Noise Ratio (OSNR) to improve performance.

Other capabilities demonstrated as part of this trial include a new Matrix Enhanced Phase Shift Keying (ME-PSK) modulation technique that handily surpasses Binary Phase Shift Key (BPSK) reach performance; and the new, high-gain SD-FEC algorithm.

"The comprehensive modulation and compensation techniques in our Advanced Coherent Toolkit enable individual carriers and subcarriers in the super-channel to maximize the overall reach and capacity of the customer's fiber," said Scott Jackson, VP of Infinera's Subsea Business Group. "For example, leveraging these techniques allows cables that previously could only support BPSK to move to higher modulation formats in the future, or support a mix of formats across carriers and subcarriers, for increased fiber capacity and a better return on the asset. This next generation of coherent technology has the potential to dramatically extend the useful life for existing cable systems while also improving the performance of new cables."

http://www.infinera.com

Thursday, December 10, 2015

Nokia Hits 428 Mbps w TD-LTE with 3-Band CA and 256QAM

Nokia Networks, together with SK Telecom, demonstrated 428 Mbps data transmission using TD-LTE 3xCA with 256 QAM.

The test used a Qualcomm  Snapdragon X12 LTE modem along with Nokia's Flexi Multiradio 10 Base Station and software to aggregate three carriers on the TD-LTE band 41 spectrum (2496 – 2690 MHz).

The companies said this lays the foundation for the introduction of TD-LTE in Korea, with Nokia’s Single RAN Advanced platform as a foundation for SK Telecom.

http://networks.nokia.com/


  • In November, Nokia Networks has achieved a transmission speed of 19.1 Gbps and lower latency using 5G cmWave technology in a trial in South Korea. 
  • The trial used an OFDMA-based TDD system with 4x100 MHz carriers and 8x8 Multiple-Input Multiple-Output (MIMO), enabling eight independent data streams sent between the base station and the user device. In addition, 256QAM modulation enables the sending of eight bits of information per modulation symbol. The scaled OFDM has a shorter symbol length and Transmit Time Interval (TTI) that is expected to achieve a lower latency than with LTE.


http://networks.nokia.com/news-events/insight-newsletter/articles/nokia-achieves-5g-speed-record

Monday, September 28, 2015

Inphi Demos 400G PAM4 IC Solutions With NeoPhotonics

At this week's ECOC 2015 in Spain, Inphi is demonstrating interoperability of the industry's first 4-level Pulse Amplitude Modulation (PAM4) PHY IC chipset solution for service provider interconnects.

The demonstration showcases 100G dual lambda optical link performance with 2-10km SMF fiber loopback featuring Inphi's PAM4 IC solutions and NeoPhotonics' Q-TOSA 100G EML-based modules. This demonstration shows that transferring the complexity from optics into CMOS electronics with PAM encoding, DSP and FEC technologies, one can attain four times as much bandwidth improvement compared to existing solutions, at a lower cost.

The companies said PAM4 modulation is the modulation scheme that will take the industry over the next wave of Ethernet deployments for optical and copper interconnects by doubling the bits per symbol at the same baud rate.

"Our interoperability demo with ecosystem partners, such as NeoPhotonics, achieves excellent bit-error-rate and optical link budget, and proves that the PAM4 technology is ready and available today to help designers build IEEE P802.3bs 400G LR8 line cards and modules for next generation service provider platforms," said Siddharth Sheth, vice president, Networking Interconnect, Inphi.
NeoPhotonics Corporation is a leading designer and manufacturer of photonic integrated circuit, or PIC, based modules and subsystems for bandwidth-intensive, high-speed communications networks. As part of this demo NeoPhotonics will showcase its new 4x28G Q-TOSA module, that incorporates four channels of PIC integrated transmitters utilizing proven high performance electro-absorptive modulated lasers (EML), which meets the stringent ITU-T standard required by Telecom service providers and also satisfies the datacom requirement.

"This joint demo with Inphi PAM4 chip demonstrates the ability of our very high bandwidth EML to generate superior performance in High Order of Modulation (HOM) based platforms. It has been proven at both 28GBaud and 56GBaud, which will enable future systems with higher link capacity to serve the continuous market demand for increased bandwidth," said Tim Jenks, CEO of NeoPhotonics.

http://www.inphi.com

Monday, July 13, 2015

Alcatel-Lucent Submarine Networks Carries 300G Signal over 10K km

Alcatel-Lucent Submarine Networks (ASN) announced a record of data transmission over a distance of 10,000 kilometers using real-time processing prototypes of a unique 300 Gbps modulation technology that will optimize the performance of submarine cable systems.

The trial, which was conducted on the 10,000km of ASN’s test bed, combined the new 300G 8QAM (8 quadrature amplitude modulation) technology of ASN’s 1620 SOFTNODE platform and second-generation coherent submarine fiber (CSF-2).

ASN said its 8QAM technology can optimize both existing and new undersea cable systems, enabling operators to deliver more than 15 terabits-per-second per fiber pair on transoceanic systems/

Olivier Gautheron, Chief Technology Officer of Alcatel-Lucent Submarine Networks said: “This breakthrough underlines ASN’s strategic focus in R&D to raise the bar for undersea fiber-optic technology. Our researchers continue to develop new solutions to further apply our own innovation to help traditional and web-scale operators cope with increasing requirements for speed, capacity and cost-effectiveness.”

https://www.alcatel-lucent.com

Tuesday, June 23, 2015

Coriant Announces CloudWave Optics with Programmable Modulation

Coriant unveiled a suite of software-programmable photonic layer technologies for bringing flexibility, efficiency, and scalability to next-generation optical transmission networks.

The Coriant CloudWave Optics suite includes photonics, software programmable line side modulation, tunable spectral allocation, and channel frequency flexibility capabilities. The suite can be implemented on the Coriant hiT 7300 Multi-Haul Transport Platform and the Coriant mTera™ Universal Transport Platform.

Key features and benefits of Coriant's flexi-rate solutions portfolio include:

  • Flexible, multi-functional provisioning of service capacity with a single, compact and software-programmable line side interface that can dynamically adapt to a wide range of metro, regional, LH, ULH, subsea, and DCI transport applications
  • Cost-optimized capacity, reach and service performance based on a unique combination of flexi-rate and super-channel features with dynamically adjustable modulation formats (e.g., QPSK, 8QAM, 16QAM), flexible bit rate transmission options (100G, 200G, 300G, 400G), and state-of-the-art RAMAN with up to 25.6Tb/s per fiber in meshed optical networks
  • Lower total cost of ownership via industry-leading power and space efficiency, increased spectral efficiency (up to 33%), increased fiber capacity (up to 166%), and reduced sparing requirements
  • Optimal utilization of optical channel capacity with an innovative, software-programmable system architecture that maximizes client/line-side interconnectivity and throughput efficiencies
  • Seamless interworking with all legacy and third-party infrastructure (e.g., fixed, colorless, directionless, gridless, 40/80/96 channels, etc.), all major fiber types, and across Coriant's metro, ULH/LH, and DCI-optimized packet optical transport platforms

"Increased demand for dynamic, cloud-centric services and applications is a driving force behind innovation in optical layer technologies," said Ken Craft, Executive Vice, Products and Technology, Coriant. "Our programmable flexi-rate capabilities are specifically designed to help service providers and data center operators efficiently and cost-effectively scale their service infrastructure in the face of continued demand for network capacity and highly unpredictable traffic patterns and transport connectivity requirements."

http://www.coriant.com/company/press_release.asp?id=1231

See also