反射器在PON的OTDR测试与诊断中的应用研究

doi:10.3969／j.issn.1000-0801.2014.04.018

Abstract

Abstract:

A mathematic model was built-up to analyze ODN attenuation event detection in OTDR system of PON, and then combining the mathematic analysis and experimental result, the application value and necessity of wavelength-selective reflector in PON optical link test and diagnosis system were investigated. Based on operators' requirements, several implementations of reflector were proposed and analyzed, and technical requirements for reflector were given. Finally, the international and domestic standardization progress of reflector was introduced.

Key words: passive optical network, optical time-domain reflector, optical link test and diagnosis, optical distribution network, reflector

Chengbin Shen,Zhe Du,Ming Jiang,Bo Wang. Application of Reflector in OTDR Test and Diagnosis System of PON Network[J]. Telecommunications Science, 2014, 30(4): 123-128.

分光比	某一分支光纤上发生的衰减事件的强度／dB	计算得到的OTDR测试曲线上的可观测到的衰减强度／dB	试验观察到的OTDR 测试曲线上的可观测到的衰减强度／dB
4	5	0.553 5	0.567／0.52^注1
	3	0.450 1	0.449／0.27^注2
	1	0.210 2	无法测得^注3
16	5	0.125 7	无法测得^注3
	3	0.104 1	无法测得^注3
	1	0.050 7	无法测得^注3
32	5	0.061 9	无法测得^注3
	3	0.051 4	无法测得^注3
	1	0.005 0	无法测得^注3
注1：采用EXFO公司商用OTDR在1 625 nm（10 ns脉宽）波长测试得到数据为0.567 dB，采用EXFO公司商用OTDR在1 550 nm波长（30 ns脉宽）测到数据为0.52 dB。
注2：采用EXFO公司商用OTDR在1 625 nm波长（10 ns脉宽）测试得到数据为0.449 dB，采用EXFO公司商用OTDR在1 550 nm波长（30 ns 脉宽）测试得到的数据为0.27 dB（由于1 550 nm波长对弯曲事件没有1 625 nm波长敏感，测试值比理论值偏小）。
注3：超过了EXFO公司商用OTDR的检测灵敏度，无法分辨出衰减事件。

项目	参数值	说明
插损	不做规定	PON系统工作波长为1 260～1 610 nm；反射器引入的插入损耗由光模块内部补偿，ONU光模块的外部指标（发光功率和接收灵敏度等）应符合现有的规范
	不做规定	OTDR测试波长为1 640～1 660 nm；反射器引入的插入损耗由光模块内部补偿，ONU光模块的外部指标（发光功率和接收灵敏度等）应符合现有的规范
回损	＞15 dB	PON系统工作波长为1 260～1 610 nm；国际标准和行标均规定回损不小于20 dB，考虑到OLT侧均设置截止滤波器，可放宽到不小于15 dB
	＜10 dB	OTDR测试波长为1 640～1 660 nm
隔离度	＞22 dB	指下行工作波长（如1 490 nm）接收机处对OTDR测试信号的隔离度，该指标包含了波长选择性反射器和工作波长接收机处的截止滤波器的隔离作用
工作温度	-20～+70℃

项目	参数	说明
插损	＜0.5 dB	PON系统工作波长：1 260～1 610 nm
	＞15 dB	OTDR测试波长：1 640～1 660 nm
回损	＞18 dB	PON系统工作波长：1 260～1 610 nm
	＜3 dB	OTDR测试波长：1 640～1 660 nm
工作温度	-20～+70℃

[1]	Dan GENG,Yong GUO,Yongjia YIN,Zhuang MA,Weiliang ZHANG. Development and experiment research of 25 Gbit/s passive optical network [J]. Telecommunications Science, 2017, 33(2): 128-132.
[2]	Shunli QIU,Yi YANG,Rong HU. A novel low cost bidirectional transmission coherent passive optical network system [J]. Telecommunications Science, 2016, 32(7): 146-151.
[3]	Yuehua Ou,Yan Ren. OTDR Integrated in OLT PON Port [J]. Telecommunications Science, 2015, 31(9): 190-200.
[4]	Tiejun Zhao,Ke Lin,Deli Xiu,Weiping Lin. Design of Intelligent Community System Based on Passive Optical Network and Middleware Technology [J]. Telecommunications Science, 2015, 31(5): 114-120.
[5]	Rentao Gu. Optical Access Network Evolution Trends：Software Defined Optical Access Network [J]. Telecommunications Science, 2015, 31(10): 57-65.
[6]	Min Cao,Ming Jiang,Chengbin Shen,Tao Zeng. Study on PON Based LTE Small Cell Backbaul Tecbnology [J]. Telecommunications Science, 2014, 30(7): 125-129.
[7]	Ming Jiang,Chengbin Shen,Jun Zhang,Min Cao. Research on Abnormal Light Emitting ONU Detection Technologies in PON [J]. Telecommunications Science, 2012, 28(8): 22-26.
[8]	Song Jiang,Ming Jiang,Chengbin Shen,Bo Wang. Study on Candidate Technologies for NG-PON2 [J]. Telecommunications Science, 2012, 28(8): 31-39.
[9]	Chengbin Shen,Chengwei Wang,Ming Jiang,Bo Wang. Progress ＆ Application of Next Generation PON Technology [J]. Telecommunications Science, 2010, 26(8): 1-7.
[10]	Chengwei Wang,Chengbin Shen,Ming Jiang. Research on PON Systems Delivering TDM Service [J]. Telecommunications Science, 2010, 26(8): 14-18.
[11]	Jidong Wang,Chengbin Shen,Ming Jiang,Chengwei Wang. Solutions to EPON Systems Carrying Traditional Copper Service [J]. Telecommunications Science, 2010, 26(8): 19-23.
[12]	Zhe Du,Chengbin Shen,Ming Jiang,Jidong Wang. Operation Administration and Maintenance of Optical Access Network Based on PON Technology [J]. Telecommunications Science, 2010, 26(8): 24-29.

Application of Reflector in OTDR Test and Diagnosis System of PON Network

RichHTML

PDF下载

Knowledge

Cited

Abstract

Cite this article

share this article

Figures/Tables 9

References 3

Related Articles 12

Metrics

Recommended 0

1	ITU-T L.53. Optical Fibre Maintenance Criteria for Access Networks, 2003
2	BBF WT-287. PON Optical Layer Management, 2013
3	沈成彬，蒋铭，杜喆等． FTTH光链路测量与诊断技术研究．电信科学， 2012,28(8): 5～9