Alcatel-Lucent Bell Labs showcased next-generation optical transmission technologies at annual OFC/NFOEC conference
Date: Thu, 03/10/2011 - 21:45
Alcatel-Lucent announced that scientists from its research arm, Bell Labs, have demonstrated a range of optical technology advances at the optical industry’s annual Optical Fiber Communication Conference and Exposition (OFC) and National Fiber Optic Engineers Conference (NFOEC) in Los Angeles, California.
The next-generation optical innovations showcased by Bell Labs at OFC/NFOEC address some of the most pressing challenges facing the optical industry: satisfying exponential growth in demand for network capacity and higher data rates while contending with increasingly severe technical limitations and cost constraints.
The solutions presented by Bell Labs feature a range of novel techniques that make it possible to transmit data at significantly higher bit rates and over significantly longer distances than what is possible today. They accomplish this by: Applying higher-order signal modulation to achieve greater spectral efficiencies; Heightening the sensitivity of optical receivers to a point approaching their fundamental limit; Exploiting new Multimode transmission to increase the capacity of optical networks by orders of magnitude.
Doubling spectral efficiencies
Doubles spectral efficiency gains to achieve a per line transmission rate of 256 Gigabits per second over a distance of 400 kilometers. The rate achieved in this experiment is more than twice that which is achievable today with the 100 Gigabit per second systems that are just coming on the market. The solution makes use of a high powered electronic circuit that converts analog signals to digital and employs a sophisticated 64-QAM modulation (Quadrature Amplitude Modulation) scheme
Achieving a record modulation/receiver sensitivity
Reduces by half the number of photons needed to transmit information and achieves a record degree of sensitivity by applying an advanced 16-ary-pulse-position-modulation scheme.
Opening a new era of research in optical transmission
First ever demonstration of transmission over a new multimode fiber type that has the potential to increase the capacity of a single fiber strand by an order of magnitude. This demonstration takes advantage of advanced fiber design, digital signal processing, and sophisticated mode or core coupling.
Bell Labs also demonstrated the first fully-integrated optical Orthogonal Frequency Division Multiplexing (OFDM) generator that is based on photonic integrated circuits using Indium Phosphide(InP).This is a key step forward in making OFDM systems that are cost and power efficient enough for practical use.
Finally, Bell Labs presented specifications for new transport network protocols that will enable enterprises to more easily access large scale data processing capabilities (High Performance Computing) while facilitating outsourcing of their computing infrastructure (Cloud Computing). Bell Labs demonstrated how network service providers will be able to maintain contracted levels of service for business applications delivered from the cloud using the new protocol specifications in conjunction with high speed wavelength-switched optical network connections that can be configured on the fly.
These innovations represent significant advances in the evolution of optical transmission over the mid to longer term by being able to accommodate demand for increasingly higher transmission speeds required to meet rapidly increasing demand for bandwidth.