Our technology

KDPOF has developed a high spectral efficiency communication technology that exploits the available capacity of large core Plastic Optical Fiber (POF). It is not only a theoretic system, but a fully engineered solution for large core standard fibers like SI-POF that can be implemented with standard microelectronic technology.

KDPOF technology uniquely approaches the available communication capacity delivering a transmission system that automatically adapts its operation (bit-rate and equalization) to variable operating conditions like temperature, fiber, bending, coupling losses, connector aging, etc.

As POF is closer to copper or air than to glass optical fiber as a transmission media, we use techniques similar to those implemented in copper and wireless communication systems to approach the maximum theoretical capacity limit of the fiber.

Transmission block diagram

 

Modulation

KDPOF technology 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 available full range of the light emitter (LED or Laser).

Laboratory measurements demonstrate that alternative complex technologies like DMT (Discrete Multi-Tone) or OFDM (Orthogonal Frequency Division Multiplexing) are overly complex, yet suboptimal solution that is not required to achieve more than 1 Gbps over standard 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 multi-level coded modulation to approach the theoretical maximum capacity of the channel. Our implementation is done with fine spectral efficiency adaptability, which provides an optimum trade-off between computational complexity and delay. This is the key, together with our non-linear equalization algorithms, to approach the POF capacity. Furthermore, the system incorporates frame structures to provide a very fast link startup and an efficient implementation of the adaptive equalization and on-the-fly bit-rate set-up.

Frame Optimization

The frame has been designed with two objectives in mind:  payload optimization and energy efficiency. Each frame carries pilot signals in order to perform an on-the-fly adaptation of the system to the channel conditions. A special mode of operation for low data workloads uses a unique type of frame to reduce the energy consumption, while minimizing the link restart.

 

 

You can download a white paper with an easy introduction to the Technology here:

Download White Paper

KDPOF Advantages

Channel Capacity

Closest approach to the theoretical maximum capacity of the channel (Shannon limit)

Implementation

Reduced area and power consumption due to efficient implementation

Adaptive Bit Rate

Flexible, “on-the-fly” adaptation to channel variations and application requirements

Self Diagnostics

Deep self diagnostic capability to monitor channel state and performance

Interfaces

Data interfaces customized for each market application

Energy Efficiency

Energy efficient Ethernet with a higher performance compared to standard Gigabit Ethernet applications

Technical Papers

KDPOF: Innovating in communications for large core Polymer Optical Fiber

June 2010

Abstract: This paper gives a general description of the company and its communication technology for POF.

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Introducing Energy Efficiency in the VDE 0885-763 Standard for High Speed Communication over Plastic Optical Fibers

August 2013

Abstract: The VDE 0885-763 standard enables 1 Gb/s communication over 50 meters of POF and is intended for use in automotive, industrial, and home networking applications. One of the goals of the standard is to achieve good energy efficiency, and to that end it incorporates a low power mode. This is similar to the case of Ethernet where a low-power mode was introduced by the Energy Efficient Ethernet (IEEE 802.3az) standard in 2010. In this paper, the energy efficiency mechanisms incorporated in the VDE 0885-763 standard are described and evaluated. The evaluation is done by simulation, and the results are also compared to those of Energy Efficient Ethernet. The conclusion is that VDE 0885-763 will provide good energy efficiency even at low/medium loads.

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