“approaching the Shannon limit”

WHAT CAN WE OFFER YOU?

KDPOF has developed a high spectral efficiency communication technology that exploits the capacity of large core POF. It is not only a theoretic system, but also it is a fully engineered solution for large core fibers like SI-POF that is implementable with the state of the art of microelectronics.

KDPOF technology is a capacity achieving communication system that automatically adapts the operation (bit-rate and equalization) to variable conditions as temperature, fiber, bending, coupling losses, connectors, guiding conditions, etc.

Our point of view is to use techniques similar to those implemented in copper and wireless communication systems to approach the capacity limit of the fiber. POF, as communication channel, is closer to be considered as a copper cable than as a Glass Optical Fiber (GOF).

Modulation

KDPOF is based on time domain modulations. Time domain modulation provides a low Peak-to-Average Ratio (PAR), hence the transmit signal variance is maximized to use the full range of the light emitter (LED or Laser).

Laboratory measurements based on our system design demonstrate that DMT (Discrete Multi-Tone) or OFDM (Orthogonal Frequency Division Multiplexing) are not required to achieve more than 1 Gbps over std SI-POF.

KDPOF products incorporate efficient Digital Signal Processing (DSP) algorithms to dynamically compensate the non-linear distortion caused by the optoelectronic components as well as the modal dispersion caused by the fiber itself.

Channel coding

KDPOF implements capacity achieving multilevel coded modulation with fine spectral efficiency adaptability, which provides a very good tradeoff between computational complexity and delay. This is the key, together with the developed non-linear equalization algorithms, to approach the capacity of POF. Furthermore, the system incorporates frame structures to provide a very fast link startup and an efficient implementation of adaptive equalization and adaptive bit-rate.

Coupled optimization

Usually the receivers for optical fibers are designed according to the optimization of the eye-diagram, looking for the optimum tradeoff between ISI (Inter-Symbol Interference) and SNR (Signal-to-Noise Ratio).

KDPOF introduces a novel criterium in POF systems design, optimizing in a coupled manner the digital and the analog front ends. This is carried out by accurate numeric algorithms that maximize the communication capacity from Information Theory point of view.

Design patterns

KDPOF products are developed according to a design flow based on hierarchically structured software patterns, that enable for a coupled optimization of all their parts and for an iterative design based on very detailed model simulations. Therefore, the cost and the time-to-market is drastically reduced and the performance is easily anticipated making possible an efficient product strategy.

Ⓒ2011 Knowledge Development for POF S.L.