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

SIMULATING POF

Introduction

We have developed accurate models and a simulation framework that allow us to evaluate our communication system as well as to make the parameterization needed for the prototype emulation and the ASIC design.

Simulating optics

The simulation process is divided in two main steps: the optics simulation and the communication system simulation.

First of all we obtain the channel model equivalent to all the optics involved in the POF transceiver and the fiber. Therefore this simulation takes into account the light power transfer from the light emitter to the photo-detector transmitted through the POF. This stage resolves the channel impulse response taking into account chromatic and modal dispersion.

Next figures show several results from optics simulation for a given test scenario that is considered here as example:

1. • SI-POF: Mitsubishi Eska GH4001 (NA 0.5)
   

2. • Light emitter: green LED UMD (Uniform Mode Distribution) NA 0.5, 520 nm, Δλ=40 nm
   

As another example, we show the same results for a laser diode:

1. • SI-POF: Mitsubishi Eska GH4001 (NA 0.5)
   

2. • Light emitter: red LD GMD (Gaussian Mode Distribution) NA 0.25, 650 nm, Δλ=2 nm
   

Simulating the communication system

The second simulation step uses the previous channel model, adds the equivalent electric circuit models for optoelectronic components and connects them to the digital communication system through the Analogue Front End (AFE). The last includes DAC, ADC, AGC, TIA, Drivers, etc. Non-linearities from light emitters are also considered.

The simulation includes the full functionality of the communication system, which is enabled and evaluated, i.e. synchronization, timing-recovery, channel estimation, noise estimation, channel equalization, rate adaptation of channel coding sub-system, etc.

Ⓒ2010 Knowledge Development for POF S.A.