光网络基础——光纤、光缆、光连接器(2)

G.652光纤

Table I.2/G.652 – Differential group delayMaximum PMDQ (ps/ km ) No specification Link length (km) Implied Fibre induce dmaximum DGD (ps) Channel bit rates

Up to 2.5 Gbit/s 400 25 10 Gbit/s 0.5 40 19.0 (Note) 10 Gbit/s 2 7.5 40 Gbit/s 3000 19 10 Gbit/s 0.2 80 7 40 Gbit/s >4000 12 10 Gbit/s 0.1 400 5 40 Gbit/s NOTE – This value applies also for 10 Gigabit Ethernet systems.

G.652光纤 应国内光纤厂商的申诉，2003年7月1日，我国商

务部发布公告，立案对原 产于美国、日本和韩国的G.652光纤产品进行反倾销调查，这是我国通信行 业的第一起反倾销诉讼。 康宁已经宣布从2003年12月15日起在全球范围内终止销售G.652A、B光纤。 在OFS(原美国朗讯)的中文网站上，也已经去除了G.652A和G.652B光纤的 标准，取而代之的是G.652C、G.652D的标准。

05年1月1日，商务部发布2004年第96号公告，最终裁定原产于美国、日本、 韩国的进口非色散位移单模光纤(G.652A、G.652B、G.652C、G.652D) 存在倾销。为此，商务部决定自2005年1月1日起，对原产于美国、日本、 韩国的进口被 调查产品征收7%-46%不等的反倾销税，期限为5年。 美国康宁公司终裁倾销幅度为1.51%,根据《中华人民共和国反倾销条例》 第27条规定，属于微量倾销幅度，免于征收反倾销税。”

G.655光纤 G.655.A Attributes, contains recommended attributes and values to support many G.691, G.692, G.693, and G.959.1 applications. Concerning G.692 applications, depending on the channel wavelengths and dispersion characteristics of the specific fibre, the maximum total launch power could be restricted, and the typical minimum channel spacing could be restricted to 200 GHz. G.655.B Attributes, contains recommended attributes and values to support G.691, G.692, G.693, and G.959.1 applications. Concerning G.692 applications, depending on the channel wavelengths and dispersion characteristics of the specific fibre, the launch power can be higher than for fibres in the previous table, and the typical minimum channel spacing is 100 GHz or less. The PMD requirement allows operation of STM-64 systems to at least 400 km in length. G.655.C Attributes, is similar to G.655.B, but the more stringent PMD requirement allows STM-64 systems to lengths longer than 400 km and G.959.1 STM-256 applications.

G.655光纤G.655 Fibre/cable attributesAttribute Mode field diameter Detail Wavelength Range of nominal values Tolerance Nominal Tolerance Maximum Maximum Maximum Radius Number of turns Maximum at 1550 nm Minimum λmin &λ max Minimum value of Dmin Maximum value of Dmax SignDmax - Dmin

Cladding diameter Core concentricity error Cladding noncircularity Cable cut-off wavelength Macrobend loss Proof stress

G.655.A Attributes 1550 nm 8 – 11 μm 0.7 μm 125 μm 1 μm 0.8 mm 2.00% 1450 nm 30 mm 100 0.50 dB 0.69 GPa1530 nm & 1565 nm 0.1 ps/nm· km 6.0 ps/nm· km positive or negative

G.655.B attributes 1550 nm 8 – 11 μm 0.7 μm 125 μm 1 μm 0.8 mm 2.00% 1450 nm 30 mm 100 0.50 dB 0.69 GPa1530 nm & 1565 nm 1.0 ps/nm· km 10.0 ps/nm· km Positive or negative 5.0 ps/nm km

G.655.C attributes 1550 nm 8 – 11 μm 0.7 μm 125 μm 1 μm 0.8 mm 2.00% 1450 nm 30 mm 100 0.50 dB 0.69 GPa1530 nm & 1565 nm 1.0 ps/nm· km 10.0 ps/nm· km Positive or negative 5.0 ps/nm km

Chromatic dis

persion coefficient Wavelength range: 1530-1565 nm

G.655光纤

G.655 Fibre/cable attributesAttribute Detail λmin &λ max Minimum value of Dmin Maximum value of Dmax Sign Maximum Maximum at 1550 nm Maximum at 1625 nm M Q Maximum PMDQ G.655.A AttributesTBD TBD TBD Positive or negative

G.655.B attributesTBD TBD TBD

G.655.C attributes

Chromatic dispersion coefficient Wavelength range: 1565-1625 nm

Positive or negative

Uncabled fibre PMD coefficient Attenuation coefficient

(Note) 0.35 dB/km 20 cables 0.01% 0.5 ps/km

PMD coefficient

(Note) 0.35 dB/km 0.4 dB/km 20 cables 0.01% 0.5 ps/km

(Note) 0.35 dB/km 0.4 dB/km 20 cables 0.01% 0.2 ps/km

Note: An optional maximum PMD coefficient on uncabled fibre may be specified by cablers to support the primary requirement on cable PMDQ if it has been demonstrated for a particular cable construction.

低水峰单模光纤

单模光纤主要类型

熔接损耗和芯包同心度的关系

G.656光纤G.656光纤: 适用于DWDM系统S+C+L波段应用的新型光纤，即在 S+C+L波段为非零色

散的光纤 。

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