reliable and feasible technology for more than one gigabit over standard SI-POF

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Introduction

KDPOF is a high spectral efficiency communication system that exploits the capacity of large core POF. It is not only a theoretic system, but also it is a fully engineered solution for SI-POF that is implementable with the state of the art of microelectronics. It is a capacity achieving system that automatically adapts the operation to variable conditions as model of fiber, bending, coupling losses, connectors, guiding conditions, etc.

Our point of view is to use techniques commonly implemented in copper and wireless communication systems to approach the capacity limit of the fiber, because 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 variance of the signal is maximized to use the full range of the light emitter (LED or Laser).

Performed simulations 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. Furthermore, KDPOF includes efficient Digital Signal Processing (DSP) algorithms to dynamically compensate the non-linearities caused by the optoelectronic components.

Channel coding

KDPOF implements capacity achieving 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 equalization algorithms, to approach the capacity of POF.

Coupled optimization

Usually the receivers for optical fibers are designed according to the optimization of the eye-diagram, searching for a tradeoff between bandwidth and SNR (Signal-to-Noise Ratio).

KDPOF introduces a novel criterium in POF systems design, optimizing in a coupled manner the digital circuit and the analogue transceiver (Trans-Impedance Amplifier and Driver). This is carried out by accurate numeric algorithms that maximize the capacity (entropy) from the point of view of the information theory.

Design patterns

KDPOF is developed with 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 simulations. Therefore, the cost and the time-to-market is drastically reduced and the performance is easily forecasted enabling to dynamically adapt the product strategy.

Ⓒ2010 Knowledge Development for POF S.A.