OLT PON端口内置OTDR技术分析

doi:10.11959/j.issn.1000-0801.2015225

Abstract

Abstract:

Along with the propulsion of the“broadband China”strategy,FTTx has been deployed massively,therefore there are more and more requirements on detecting optic fiber faults, solutions with low cost are needed to detect fiber faults and improve the efficiency of PON operation and maintenance. OTDR integrated in OLT PON port was studied, and the implementation and the cost of different wavelength solutions were analyzed and compared. The PON system architecture based on OTDR integrated in PON port was proposed, and the requirements of OTDR detection ability and the limitation requirements of OTDR effecting the physical parameters of PON port and the communication service were given. The goal is that OTDR integrated in PON port can satisfy the requirements of operators' PON detection, and improve the efficiency of PON operation and maintenance.

Key words: optical time domain reflectometer, port detection, passive optical network

Yuehua Ou,Yan Ren. OTDR Integrated in OLT PON Port[J]. Telecommunications Science, 2015, 31(9): 190-200.

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References 8

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	非通信波长方案	上行波长方案	下行波长方案
优点	使用独立发射器和接收器，测试时不影响通信光	能够重用上行接收器	能够重用下行发射器
缺点	需要增加两个有源光器件的模块成本；受到模块的结构、尺寸的限制，给模块封装增加了难度	需停止发射上行业务光时才能进行OTDR的检测；为了减少对上行业务的影响， OTDR 检测时隙分配间隔拉长，导致OTDR测试时间变长	占用下行光功率预算；ONU接收端的消光比被减少；增加了噪声和抖动、发送眼图变差；下行抖动增加，导致上行信号的抖动性能产生一定的劣化
目前检测光纤的性能	可以检测到瑞利散射事件和菲涅尔反射事件，比如光纤弯曲事件和断裂事件，测试能力最接近外置仪表	可以检测到瑞利散射事件和菲涅尔反射事件，但检测时间取决于上行分配带宽	可以检测到瑞利散射事件和菲涅尔反射事件，调制幅度越大，OTDR 的检测事件的能力越高，但对下行光的影响越大
网络升级	模块升级时，对原光组件基本无影响。但是对于GPON和XG-PON共存于同一个ODN 时，GPON 或 XG-PON 中需要有一个OLT光模块具有OTDR检测功能，同时需要配置特殊WDM1r滤波片	升级后，10 Gbit/s接收器与模拟信号复用难度增大	需要评估OTDR信号对下行信号的影响。在10 Gbit/s PON下，下行信号除速率外，调制方式、消光比等光参数与低速PON相比都有了很大的变化，需要重新评估OTDR性能与业务性能之间的影响

方案	项目	成本/元	说明
非通信波长方案	发送器件	50	包括激光器和驱动
	接收器件	70	包括APD、TIA、APD升压
	OTDR芯片	200	芯片数模工艺复杂，要求比较高，按200元估算，最终有望降到1/3
	封装+滤波片+分光器	200	这部分成本目前无法详细估算
	合计	520
上行波长方案	发送器件	50	包括激光器和驱动
	接收器件	20	环路带宽和增益可变调整，现有激光器成本略有增加
	OTDR芯片	200	芯片数模工艺复杂，要求比较高，按200元估算，最终有望降到1/3
	封装+滤波片+分光器	200	这部分成本目前无法详细估算
	合计	470
下行波长方案	发送器件	20	OTDR调制在下行数据上的方式影响消光比，需要提升激光器性能，因此成本略有增加
	接收器件	70	包括APD、TIA、APD升压
	OTDR芯片	200	芯片数模工艺复杂，要求比较高，按200元估算，最终有望降到1/3
	封装+滤波片+分光器	200	这部分成本目前无法详细估算
	合计	490

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OTDR Integrated in OLT PON Port

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