Ng Boon Chuan

The overview of fiber fault localization technology in TDM-PON network

In this paper, we discussed the mechanism of optical fiber break in time division multiplexing passive optical network (TDM-PON) and the upwardly or downwardly monitoring issues with conventional fiber fault localization technique by using optical time domain reflectometer (OTDR). We also studied the previous fault localization technology that had been recommended. Finally, we proposed a centralized inline monitoring and network testing system named as centralized failure detection system (CFDS). CFDS will be installed with optical line terminal (OLT) at the central office (CO) or network operation center to centrally monitoring each optical fiber lines status and detecting the failure location that occurs in the multi-line drop region of fiber-to-the-home (FTTH) access network downwardly from CO towards the customer premises to improve the service reliability and reduce the restoration time and maintenance cost.

MATLAB-based Graphical User Interface Development for Centralized Failure Detection System (CFDS) in SCAN Network

This paper highlights the program development to increase the efficiency, survivability and reliability of customer access network. The developed program will be installed with optical line terminal (OLT) at the central office (CO) to check the status and detect the failure line that occurs in the drop region of fiber to the home (FTTH) network. Conventionally, the failure line of FTTH network can be measured using optical time domain reflectometer (OTDR) upwardly from customer to the CO. However, OTDR can only display a result of a line in a time and also time and cost misspend. It becomes a hindrance to detect failure of optical line with a large number of customer premises and large coverage area downwardly. The objective of this paper is to collect every testing result to be displayed on a computer screen. The next step is to specify the failure line in drop region of FTTH network. And then to develop a simple, attracting and user-friendly graphical user interface (GUI) for the CFDS by using the MATLAB software. Measurement for each optical line is saved in the OTDR and transferred into the computer for further analysis. This program is able to monitor the status of each optical line and detect the failure in drop region of the FTTH network.

Application of PIC microcontroller for online monitoring and fiber fault identification

This paper presents an application PIC microcontroller for online monitoring and fiber fault identification in optical fiber communication. For this propose the PIC microcontroller is used control any optical switch connected to it. The proposed system architecture is discussed in detail, considering both the hardware and software elements involved. Finally, the benefits and limitations of such a system are considered, using some initial results obtained in an experimental implementation. The system is developed and tested successfully.

Optical power budget and cost estimation for Intelligent Fiber-To-the-Home (i-FTTH)

This paper calculates the optical power budget and power margin for designing a conventional passive optical network (PON)-based Fiber-To-the-Home (FTTH) and Intelligent Fiber-To-the-Home (i-FTTH) with different link length of drop fiber and optical power splitting ratio of 1×N passive optical splitter. A simple calculation is used to determine how much loss and power are available for each individual fiber link in both networks with different type of signals. The cost estimation for both networks including the additional optical monitoring, switching, and protection systems are calculated and compared.

Lightwave measurement and characterization in passive optical network (PON)

The objective of this study is to determine and troubleshoot the problems of using handheld optical power meter and optical time domain reflectometer (OTDR) for monitoring and troubleshooting a conventional passive optical network (PON) equipped with optical splitter/coupler that used to broadcast optical signals from one fiber to many fibers. This paper proposes an appreciate approach to overcome these testing challenges. In this enhancement, a commercially available OTDR is located at central office (CO) and a tapper circuit is designed to allow the OTDR testing signal to bypass the optical splitter/coupler in a conventional PON when emitted from CO towards customer sites for centralized monitoring in downstream direction. This provides a faster, simpler, and less complex way for installation testing, service activation testing, and network performance monitoring and in-service troubleshooting a PON.

Web services for monitoring system in optical communication

This paper proposed an application of microcontroller embedded Ethernet to monitoring system in optical communication. We focus on distributed real-time systems, which stand to benefit most from the use of web services technology. For this propose the PIC microcontroller is used control any optical switch connected to it, and send information to internet. It was successfully identified without affecting communication signal transmission, with the specification available a complete system can be made with 24 man-hours. The system will to improve the service reliability and reduce the maintenance cost.

Optical measurement and management system

This paper proposes an appreciate approach to alleviate the critical issues of using optical time domain reflectometer (OTDR) for monitoring and troubleshooting a conventional passive optical network (PON) equipped with passive branching device. In this enhancement, OTDR is located at central office (CO) and a tapper circuit is designed to allow the OTDR pulse bypassing the passive branching device in a conventional PON when emitted from CO towards customer sites in downstream direction. This provides a faster, simpler, and less complex way for surveillance applications. A simulation software named Smart Access Network _ Testing, Analyzing and Database (SANTAD) is developed for providing remote controlling, optical monitoring, fault detection, and centralized troubleshooting features to assist networks operators to manage PON more efficiency and deliver high quality of services (QoS) for end-users. SANTAD increases the workforce productivity and facilitates the network management of network through centralized monitoring and troubleshooting from CO.

Protection scheme of fiber to the home passive optical network using access control system

This paper proposes and experimentally demonstrates an access control system (ACS) mechanism against distribution fiber fault in fiber to the home (FTTH) passive optical network (PON). ACS will be installed between with optical line terminal (OLT) at the central office (CO) to monitor and control each optical fiber lines status and detect the failure that occurs in the drop region of PON downstream from CO to the optical network unit (ONU). The technique is based on the remote host of optical switch, and the web-server would help discern an individual event during the monitoring of the FTTH PON in collaboration with the information provided by the optical switch. The FTTH-PON architecture can be analyzed by the monitoring method by using the OTDR at the central office (CO) under the in-service state of FTTH-PON. Moreover, the downstream traffic performance has also been measured and discussed in PON architecture.

In-service monitoring with Centralized Failure Detection System (CFDS) in FTTH access network

This paper focuses on developing a simple, attracting and user-friendly graphical user interface (GUI) for centralized failure detection system (CFDS) by using MATLAB software. The developed program will be installed with optical line terminal (OLT) at central office (CO) to centrally monitoring each optical fiber lines status and detecting the failure location that occurs in the drop region of fiber to the home (FTTH) access network downwardly from CO towards customer premises. Conventionally, the faulty fiber and failure location can be detected by using optical time domain reflectometer (OTDR) upwardly from customer premises towards CO. However, OTDR can only display a single result of a line in a time and also time and cost misspend. CFDS is interfaced with the OTDR to accumulate every network testing result to be displayed on a single computer screen for further analysis. The program will identify and present the parameters of optical line such as the lines status either in working or nonworking condition, magnitude of decreasing, failure location and other details as shown in the OTDRs screen. The analysis result will be sent to field engineers or service providers for promptly action.

Remote host fault detecting for fiber to the home passive optical network

The remote host fault detecting for FTTH-PON using web-based is demonstrated. Our solution works on a standard local area network (LAN) using a specially designed hardware interfaced with a microcontroller integrated Ethernet. The status of optical line is automatically updated to a web server which can access by remote host via internet or LAN, with the specification available a complete system can be made with 24 man-hours