Optical Transceivers for Fiber-to-the-Premises Applications: System Requirements and Enabling Technologies

Huang, Wei‐Ping; Li, Xun; Xu, Chang‐Qing; Hong, Xiaobin; Xu, Chang Qing; Liang, Wanguo

doi:10.1109/jlt.2006.888482

Cited by 25 publications

(8 citation statements)

References 64 publications

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“…It is a fully distributed sensor with the ability to locate external vibration over a long distance [ 1 , 2 ]. This sensing system has good prospects in perimeter security, power line monitoring, gas pipeline monitoring, railway system monitoring, and geological and hydrological monitoring [ 3 , 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Envelope Extraction for Vibration Locating in Coherent Φ-OTDR

Zan

Wang

Liu

et al. 2022

Sensors

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In a coherent phase−sensitive optical time−domain reflectometry (Φ−OTDR) sensing system, a frequency shift of hundreds of MHz generated by the pulse modulation of an acoustic optic modulator results in a high central frequency of a beating signal spectrum. In order to reduce the high−performance hardware requirement of signal acquisition, the coherent Φ−OTDR based on envelope extraction is proposed in this paper. Firstly, a theoretical model of a quasi−sinusoidal amplitude−modulated signal is built for the beating signal between local oscillator light and Rayleigh backward scattering light. An envelope detector is then utilized to realize the envelope extraction of beating signals with advantages of a simple structure and quick response. The extracted envelope can be directly used for vibration locating without the conventional orthogonal demodulation. Experiment results present that the sampling rate can be reduced to 10 MHz under the spatial resolution of 10 m and the sensing distance of 31 km. This scheme proves that envelope extraction is a reliable technical route for vibration locating, which can effectively reduce the sampling rate and simplify the data demodulation.

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Section: Introductionmentioning

confidence: 99%

Envelope Extraction for Vibration Locating in Coherent Φ-OTDR

Zan

Wang

Liu

et al. 2022

Sensors

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“…At present numerous papers are dealing with optical triplexer fabricated by various design concepts and different materials have appeared in the literature [1][2][3][4][5] . A triplexers comprised of the direct coupler (DC) and arrayed waveguide grating (AWG) 6 , polarization insensitive two DC-DC based on submicron silicon rib waveguides 7 , planar triplex filters using thin-film filters (TFF) on Si/SiO 2 8 , polymer optical cascade-step-size MMI filter 9 , cascade MMI-MMI (MMI-DC) silicon triplexer 10,11 and polymer MMI-DC cascade triplexer 20 .…”

Section: Introductionmentioning

confidence: 99%

Bi-directional triplexer with butterfly MMI coupler using SU-8 polymer waveguides

Jeřábek

Prajzler

2015

SPIE Proceedings

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We report about a design of a bi-directional planar optical multiplex/demultiplex filter (triplexer) for the optical part of planar hybrid WDM bi-directional transceiver in fiber-to-the-home (FTTH) PON applications. The triplex lightwave circuit is based on the Epoxy Novolak Resin SU-8 waveguides on the silica-on-silicon substrate with Polymethylmethacrylate cladding layer. The triplexer is comprised of a linear butterfly concept of multimode interference (MMI) coupler separating downstream optical signals of 1490 nm and 1550 nm. For the upstream channel of 1310 nm, an additional directional coupler (DC) is used to add optical signal of 1310 nm propagating in opposite direction. The optical triplexer was designed and optimized using beam propagation method. The insertion losses, crosstalk attenuation, and extinction ratio for all three inputs/outputs were investigated. The intended triplexer was designed using the parameters of the separated DC and MMI filter to approximate the idealized direct connection of both devices.

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“…The passive optical network (PON) is a cost-efficient solution to the last-mile bottleneck in optical communication networks 1 . And to further reduce the cost per subscriber, a Fabry-Perot (FP) laser diode (LD) is preferred as the transmitter at the optical network units (ONUs) because of its lower cost compared to distributed feedback (DFB) LD.…”

Section: Introductionmentioning

confidence: 99%

Investigation of mode partition noise in Fabry-Perot laser diode

Guo

Deng

et al. 2014

SPIE Proceedings

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Passive optical network (PON) is considered as the most appealing access network architecture in terms of costeffectiveness, bandwidth management flexibility, scalability and durability. And to further reduce the cost per subscriber, a Fabry-Perot (FP) laser diode is preferred as the transmitter at the optical network units (ONUs) because of its lower cost compared to distributed feedback (DFB) laser diode. However, the mode partition noise (MPN) associated with the multi-longitudinal-mode FP laser diode becomes the limiting factor in the network. This paper studies the MPN characteristics of the FP laser diode using the time-domain simulation of noise-driven multi-mode laser rate equation. The probability density functions are calculated for each longitudinal mode. The paper focuses on the investigation of the k-factor, which is a simple yet important measure of the noise power, but is usually taken as a fitted or assumed value in the penalty calculations. In this paper, the sources of the k-factor are studied with simulation, including the intrinsic source of the laser Langevin noise, and the extrinsic source of the bit pattern. The photon waveforms are shown under four simulation conditions for regular or random bit pattern, and with or without Langevin noise. The k-factors contributed by those sources are studied with a variety of bias current and modulation current. Simulation results are illustrated in figures, and show that the contribution of Langevin noise to the k-factor is larger than that of the random bit pattern, and is more dominant at lower bias current or higher modulation current.

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Optical Transceivers for Fiber-to-the-Premises Applications: System Requirements and Enabling Technologies

Cited by 25 publications

References 64 publications

Envelope Extraction for Vibration Locating in Coherent Φ-OTDR

Envelope Extraction for Vibration Locating in Coherent Φ-OTDR

Bi-directional triplexer with butterfly MMI coupler using SU-8 polymer waveguides

Investigation of mode partition noise in Fabry-Perot laser diode

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