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ONU弱光对网速的影响（图）
ONU 弱光 网速 光猫
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2023/11/6
ONU就是我们俗称的“光猫”，ONU弱光是指ONU接收的光功率小于ONU接收灵敏度的现象。ONU的接收灵敏度指的是ONU正常工作时可接收的最小光功率，通常，家宽ONU的接收灵敏度指标为-27.0dBm。虽然从2018年开始，相关标准中ONU的接收灵敏度指标已经提升到了-28.0dBm，但由于现网中的ONU大部分是2018年前的产品，所以，一般将ONU收光功率低于-27.0dBm定义为ONU弱光。
提起宽带光纤接入中的用户侧设备，我们常会见到ONU、ONT、SFU、HGU等英文名词，这些名词都代表什么？又有什么区别呢？
光和无线(Fiber-Wireless, FiWi)混合网络可以有效解决“随时随地”接受高速业务的网络接入问题。作为FiWi网络的关键节点，ONU数目和位置很大程度上决定了网络的成本和性能。为降低FiWi网络的建设成本，提升网络性能，该文基于EPON-WIMAX混合组网的FiWi网络，提出一种ONU部署策略，基于改进的遗传算法优化ONU部署，在使ONU数量最少的基础上，保证一定程度上的负载均衡。仿...
Symmetric 10G-EPON ONU Burst-Mode Transceiver Employing Dynamic Power Save Control Circuit
10G-EPON ONU Burst-Mode Employing Dynamic Save Control Circuit
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2015/5/18
Symmetric 10G-EPON ONU burst-mode transceiver employing dynamic power save control circuit was, for the first time, developed. Reduction of power consumption up to 37.7% was successfully achieved with...
为有效解决绿色无源光网络中的节能效果与时延性能的矛盾，提出一种支持ONU模块独立不连续收发数据的节能方法。通过光网络单元的模块化，各能耗模块独立地切换睡眠或唤醒模式，从而在规定时隙内实现不连续地收发数据；通过子周期划分，将实时业务集中到第一个子周期内收发，提升了网络的总体服务质量；提出完全独立的上下行带宽分配算法，使所提方法在流量上下行不对称的应用场景更具优势。仿真表明，所提方法在保证业务时延性能...
100-km uplink transmission of 10G- and 1G-ONU co-existing TDM-OCDMA-PON system using dual-rate burst-mode receiver
Networks Optical communications
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2015/5/22
In a cost-effective TDM-OCDMA-PON system without en/decoder at each ONU, the uplink dispersion-compensation-free 10 Gbps/1 Gbps-co-existing TDM x 4-OCDMA transmission over 100 km SMF is demonstrated b...
On an ONU for Full-Duplex 10.5 Gbps/λ with Shared Delay Interferometer for Format Conversion and Chirp Filtering
ONU Full-Duplex 10.5 Gbps/λ Shared Delay Interferometer Format Conversion Chirp Filtering
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2015/5/21
Chirped IRZ downstream is used together with a delay interferometer and a RSOA at a low complexity ONU for full-duplex 10.5Gbps transmission on a single wavelength, supported by modulation format conv...
An SLA-Based Energy-Efficient Scheduling Scheme for EPON with Sleep-Mode ONU
SLA-Based Energy-Efficient Scheduling Scheme EPON Sleep-Mode ONU
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2015/5/21
We propose an SLA-based scheduling scheme for EPON in which OLT can adjust sleep time and ONU can quit sleep mode for sending expedited frames. Considerable energy can be saved under practical power c...
OCDMA PON supporting ONU internetworking based on gain-switched Fabry–Perot lasers with external dual-wavelength injection
Fiber optics and optical communications Fiber optics communications
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2016/12/2
We propose and demonstrate an OCDMA-PON scheme with optical network unit (ONU) internetworking capability, which utilizes low-cost gain-switched Fabry-Pérot (GS-FP) lasers with external dual-wavelengt...
Demonstration of Energy Conserving TDM-PON with Sleep Mode ONU using Fast Clock Recovery Circuit
Fiber optics components Networks
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2015/6/9
A n energy conserving TDM-PON architecture using sleep mode ONU is presented. Sleep mode ONU with fast wake-up capability is demonstrated. The architecture employs novel just-in-time sleep control sch...
Deployment analysis of TDM/WDM Single Fiber PON with Colourless ONU Operating at 2.5 Gbps Subcarrier Multiplexed Downstream and 1.25 Gbps Upstream
Optical communications Optical networks
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2015/6/5
A single-fiber full-duplex hybrid TDM/WDM-PON is demonstrated to operate at 2.5/1.25 Gbps rates, with RSOA ONU. It achieves high power budget (GPON compliant) at a distances higher than 20km, and serv...
Symmetric 10G-EPON ONU transceiver integrated with newly-developed burst-mode pre-bias timing control IC
Networks Optical communications
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2015/6/4
We developed symmetric 10G-EPON ONU transceiver fully compliant with IEEE802.3av PR30.Output power of +5dBm, sensitivity of -32.4dBm, and fast LD turn-on/off time of 10ns/7ns were successfully achieve...
10Gb/s Bi-directional Symmetric WDM-PON System based on POLMUX Technique with Polarization Insensitive ONU
Optical communications Networks
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2015/6/4
We demonstrated 10Gb/s bi-directional symmetric transmission based on polarization-division multiplexing with a centralized light source. One of two orthogonal polarization states carries downstream d...
城市道路WOBAN中基于车流量的ONU位置评价机制
混合无线 光纤宽带接入网（WOBAN） 光网络单元(ONU) ONU安置 车流量 城市道路
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2009/11/2
提出了利用混合无线光纤宽带接入网(hybrid WirelessOptical BroadbandAccess Network,简记为WOBAN)把宽带业务延伸至车辆的新思路，给出了一个城市道路的工作模型.考虑到车流量是影响光网络单元，即ONU有效安置的关键因素，特别设计了一个基于流量的城市道路特征抽取机制，区分出四类不同的考察点.在此基础上，提出并比较了两种ONU位置评价策略.
ONU Optimal Gain and Position of the Distribution Element in Rayleigh-limited WDM and TDM PONs with reflective ONU
ONU Optimal Gain Rayleigh-limited WDM TDM PONs reflective ONU
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2015/7/20
The influence of the distribution element position in PONs is reported. Best Crosstalk-to-Signal ratio (C/S) is achieved if it is placed either in the ONU or OLT vicinity with optimum ONU gain dependi...