Each ONT end device just requires one strand of single mode fiber. 无源光局域网中常用的连接器是SC/APC角抛光连接器. 注意:一些制造商现在提供了一种方法，在光纤工厂已经安装的应用中利用多模光纤.

在无源光局域网中，每个终端设备需要一条单模光纤. 在无源光局域网中，典型的连接器是SC/APC端角抛光连接器. If you have existing single mode in your backbone, then you’re halfway there.

无源光LAN (POL)架构主要使用单模光纤，因为介质的高容量和支持长链路长度(可达20公里)的能力. 在波尔 architecture. 在波尔, a passive single-mode fiber network runs down to the desktop, 通过光分配器进入瘦客户端边缘设备或光网络终端(ONT). Recently single-mode to multimode optical splitters have been introduced that 使现有的多模光纤电缆在建筑物内和校园内的无源光局域网的成本效益得到重用.

Most likely you are looking at either OM4 or OM5 multimode fibers. Of course single mode will always be an option, but on the multimode side you have OM5 fiber, 这是优化的短波分复用(SWDM)，所以取决于你需要支持的距离, those to fiber types will give you the most cost effective solution.

Wavelength division multiplexing (WDM) allows multiple wavelengths, typically 2 or 4 wavelengths over a single fiber.  IEEE 802.3 bs 200 Gb / s & 400gb /s Ethernet Task Force在2016年增加了200gb /s能力，以支持成本和性能优化到400gb /s的迁移路径，其中包括对200gb /s的支持，至少有2公里的SMF (4l 波分复用双纤维) and at least 10 km of SMF (4 l 波分复用双纤维).

Some important changes to tia - 942-B Data Center Standard include:

• Added MPO-16, MPO-32 (ANSI/蒂雅-604-18) and MPO-24 (ANSI/蒂雅-604-5)
• 添加类别8
• Changed recommendation to category 6A or higher
• Added wideband laser-optimized 50/125 µm multimode (OM5)
• Added 75-ohm broadband coaxial cables and connectors (ANSI/蒂雅-568.C-4)
• 增加了在非连续路径中添加纤维的建议，这可能会导致微弯曲
• 建议机柜深度为1200mm(48”)，并考虑机柜宽度大于600mm(24”)
• 建议考虑预终止布线，以减少安装时间，提高终止的一致性和质量
• Recommends considering need for proper labeling, 电缆路由, 有线电视管理, 并且能够在不破坏现有或邻近连接的情况下插入和移除电线
• EDAs中直接连接电缆的最大电缆长度从10米(33英尺)减少.)到7米(23英尺.). (Direct attach cabling between rows is not recommended).

Other relevant changes include:

• 单模光纤的回波损耗从最小26dB改变到最小35dB, making field terminations more difficult
• Polarity in Testing; used to be covered in ANSI/蒂雅 -568.0-D and now is addressed in 568.3-D.

To support the high bandwidths required in data centers, most companies are installing at least OM4, laser optimized multimode fiber. 一些公司正在安装单模光纤，但这需要更昂贵的光学设备. A new option that is emerging is OM5, 一种允许短波分复用的宽带宽多模光纤. 这意味着这种光纤可以在同一根光纤上传输多个波长的光, 显著增加带宽，但仍然允许使用低成本的多模光学.

WBMMF是ANSI/蒂雅- 492aaae中规定的一种较新的光纤介质，ISO/IEC和蒂雅将其命名为OM5多模光纤. 这种50/125µm多模激光优化光纤最初是为了支持短波分复用(SWDM)而开发的，并支持4个25Gb/s的传输波长，在双工LC链路上聚合100 Gb/s的传输, a popular and familiar interface in the data center. WBMMF支持850 nm到953 nm之间的4种波长，使用多模光学. WBMMF was designed for use in data centers.

而有些人选择安装单模光纤，因为它的高带宽, multimode fiber continues to be a popular choice for enterprise applications. Newer grades of multimode fiber, such as OM4 laser optimized fiber and OM5, wideband multimode fiber, have the bandwidth to support most applications over the distances required, plus the cost for the optics remains lower than the cost of singlemode optics.

是的. ANSI / 蒂雅 / eia - 568 b.3 sets performance specifications, 最小弯曲半径标准和最大拉力50/125微米和62.5/125-micron fiber optic cables. For inside plant cable, 无拉负荷时，电缆弯曲半径为电缆外径的10倍, 在拉伸负载性能测试和鉴定过程中，电缆外径的15倍. 如果您有兴趣了解更多betway体育BIMMF的状态或参与讨论，您可以 access the schedule for TR-42.12在这里 and download recent meeting reports.