Implementation of the pulse interval modulation code 3B17P for a 90 Mbit/s LED single mode fibre system

Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI:10.1109/PACRIM.1989.48392

S. Vandenbrink, P. Goud, C. G. Englefield

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引用次数: 5

Abstract

A modified version of pulse position modulation (PPM), asynchronous digital pulse interval modulation (PIM), is examined. The modulation scheme strengthens the viability of using LEDs as sources on a single mode fiber system, by allowing an increase in the peak power coupled into the fiber. First, an overview of the PIM code is provided. This is then followed by a detailed description of the 3B17P PIM code, which was implemented in an experimental 90-Mb/s communication system. Experimental results of the system's bit error rate (BER) versus the average received power were obtained for both the PIM and NRZ code over a coaxial cable link. The results are compared and discussed. The PIM code has a power advantage of up to 3.5 dB over the NRZ binary code. At a constant peak received power, the effect of the threshold level on the BER is similar for both codes at a high SNR. At a low SNR, there appears to be an optimal threshold level that depends on the duty cycle of the received code.<>

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90 Mbit/s LED单模光纤系统脉冲间隔调制代码3B17P的实现

对脉冲位置调制(PPM)的改进版本——异步数字脉冲间隔调制(PIM)进行了研究。通过允许增加耦合到光纤中的峰值功率，该调制方案增强了在单模光纤系统中使用led作为光源的可行性。首先，提供PIM代码的概述。接下来是3B17P PIM代码的详细描述，该代码在一个实验性的90 mb /s通信系统中实现。在同轴电缆链路上得到了PIM码和NRZ码的误码率(BER)与平均接收功率的实验结果。对结果进行了比较和讨论。PIM代码比NRZ二进制代码具有高达3.5 dB的功率优势。在恒定的峰值接收功率下，阈值水平对高信噪比下两种码的误码率的影响是相似的。在低信噪比下，似乎存在一个最佳阈值水平，这取决于接收到的代码的占空比。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

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