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Experimental evaluation and improvement methods for low cost transmitters in long reach PONs

机译:长距离PON中低成本发射机的实验评估和改进方法

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摘要

An extensive experimental research of an optical access network behaviour has been realized, in the framework of studying distance enhancement of long reach passive optical networks (PONs), while maintaining low cost and high performance. The network system has been implemented with low cost transmitters - operated at low driving voltage, without the use of electrical amplification, at 10 Gb/s - and with colourless optical network units (ONUs) as receivers. Although studied for variable lengths, error-free transmission (target bit-error rate at 10~(-9)) over 100 km reach has been achieved in several ways. The performance of extended PONs, when low cost transmitters operated at low driving voltage are utilized, is improved by the application of optical dispersion compensation and electronic equalization techniques. The chirp of the transmitter has been shown to have an important effect on the behaviour of the system because of the dispersion phenomenon. It is observed however, that the combined use of optical dispersion compensation and electronic equalization gives a reduction of 5-10 dB of the required optical signal to noise ratio (OSNR) for an error-free transmission. Moreover, it significantly reduces the heterogeneity of the system performance for several distances, yielding a predictable behaviour, while at the same time permits the use of handy, inexpensive and integrated transmitters.
机译:在研究长距离无源光网络(PON)的距离增强的同时,保持了低成本和高性能的框架下,已经实现了对光接入网络行为的广泛实验研究。该网络系统已实现了低成本的发送器-在低驱动电压下以10 Gb / s的速度在低驱动电压下运行-并使用无色光网络单元(ONU)作为接收器。尽管针对可变长度进行了研究,但已通过多种方式实现了100 km范围内的无差错传输(目标误码率为10〜(-9))。当利用在低驱动电压下运行的低成本发射器时,扩展的PON的性能可通过应用光学色散补偿和电子均衡技术得到改善。由于色散现象,已经表明发射机的线性调频脉冲对系统的性能有重要影响。但是,可以观察到,将光学色散补偿和电子均衡功能结合使用,可实现无差错传输所需的光信噪比(OSNR)降低5-10 dB。而且,它在多个距离上显着降低了系统性能的异质性,产生了可预测的行为,同时允许使用方便,便宜且集成的发射器。

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