[논문]Real-time Monitoring of Ethernet Passive Optical Network Using Burst-mode FBGs

Binh, Nguyen Khac; Choi, Su-il

doi:10.3807/copp.2020.4.3.186

Real-time Monitoring of Ethernet Passive Optical Network Using Burst-mode FBGs 원문보기

Current optics and photonics, v.4 no.3, 2020년, pp.186 - 192

Binh, Nguyen Khac (Department of Electronics and Computer Engineering, Chonnam National University) , Choi, Su-il (Department of Electronics and Computer Engineering, Chonnam National University)

Abstract ▼ AI-Helper

This paper describes a real-time monitoring system in Ethernet passive optical networks (EPON) that uses burst-mode fiber Bragg grating (FBG) optical sensors. The FBG interrogation unit in the optical line terminal (OLT) transmits the monitoring wavelength to optical network units (ONUs). The FBG sensor unit in each ONU returns a burst-mode monitoring signal to the OLT. As the system applies time division multiple access (TDMA), a uniform Bragg wavelength can be used to monitor the EPON system. The FBG interrogation unit analyzes the received burst-mode monitoring signals and outputs fault information on the ONU branches in EPON. The simulation results show the effectiveness of the proposed monitoring system based on TDMA. In addition, we compared the proposed TDMA-based monitoring system with a WDMA-based monitoring system.

주제어

표/그림 (12)

그림 FIG. 1. Schematic diagram of fiber Bragg grating.
그림 FIG. 2. PON monitoring system using burst-mode uniform FBG sensors.
표 TABLE 1. Simulation parameters
그림 FIG. 3. Simulation design of OLT and FBG interrogation unit.
그림 FIG. 4. Simulation design of ONU and FBG sensor unit.
그림 FIG. 5. Output spectrum of WDM-based monitoring system in normal operation.
그림 FIG. 7. Output spectrum of proposed TDM-based monitoring system in normal operation.
그림 FIG. 6. Output spectrum of WDM-based monitoring system in fault operation of ONU₂.
그림 FIG. 8. Output signal of proposed TDM-based monitoring system in normal operation.
그림 FIG. 9. Output signal of proposed TDM-based monitoring system in fault operation of ONU₂.
그림 FIG. 10. Received power of FBG based monitoring system of EPON.
표 TABLE 2. FBG characteristics

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가설 설정

In the case of normal operation, the output spectrum of the TDM-based monitoring system of EPON is shown in Fig. 7. The optical spectrum analyzer shows only one reflected FBG signal of 1650 nm, because a burst-mode uniform FBG sensor is used in each ONU. The peak reflected power of -22.
In this paper, we proposed a real-time monitoring system in EPON using a burst-mode uniform FBG sensor unit. The system uses Fabry-Perot LD as the monitoring source.

제안 방법

The system uses Fabry-Perot LD as the monitoring source. By transmitting the reflection signal of the burst-mode uniform FBG sensor to the OLT during the timeslot period allocated to each ONU, TDMA data transmission and TDMA monitoring signal transmission can proceed simultaneously. The rest of this paper is organized as follows: In Section II, we introduce the operation of FBG and the application of the FBG sensor, then propose the fault monitoring method using a burst-mode FBG sensor unit.
In this paper, we propose a new method for monitoring the physical layer faults between the OLT and ON Us in EPON. The FBG interrogation unit, which is located at the CO, serves as the light source for FBG optical sensors in ONUs and also analyzes the reflected monitoring signal from the ONUs.
The first simulation is performed for the conventional WDM-based monitoring system of EPON [4-7]. Because four different FBGs are used, the Bragg wavelength of each FBG sensor is assigned as 1648.
The second simulation is performed for the proposed TDM-based monitoring system of EPON. A burst-mode uniform FBG sensor is used in each ONU, and the Bragg wavelength of 1650 nm is assigned.

대상 데이터

The distances between the OLT and the four ONUs are 14 km, 16 km, 18 km, and 20 km, respectively. The FBG interrogation unit is located at the central office and the FBG sensor units are equipped in the ONUs. The output power of the FBG interrogation unit is set to 13.

참고문헌 (16)

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상세보기
C.-H. Yeh and S. Chi, "Fiber-fault monitoring technique for passive optical networks based on fiber Bragg gratings and semiconductor optical amplifier," Opt. Commun. 257, 306-310 (2006).

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상세보기
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상세보기
A. F. A. Asha'ari, N. F. Naim, and A. A. A. Bakar, "Design of optical frequency domain reflectometer (OFDR) interferometer based on fiber Bragg grating (FBG) for passive optical network (PON) monitoring," in Proc. IEEE 7th International Conference on Photonics (ICP) (Kuah, Malaysia, Apr. 2018), pp. 1-3.
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상세보기
S. Choi and J. Park, "SLA-aware dynamic bandwidth allocation for QoS in EPONs," J. Opt. Commun. Networking 2, 773-781 (2010).

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DOI : 10.3807/COPP.2020.4.3.186 [무료]
한국광학회 : 저널
Optical Society of America : 저널
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