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It can be seen from Table 1 pmd for low-rate optical fiber communication systems. Can be transferred for 2.5Gbit / s transmission systems, when pmdc 0.5 ps / √ km, 6400 km, When pmdc value of 1ps / √ km, 1600 km can be transmitted; but for high speed (10Gbit / s) system, the transmission distance significantly reduced, respectively 更多：https://www.bmcx.com/ , can only transfer 100 km and 400 km; system for ultra-high-speed (40Gbit / s), pmd has seriously restricted the use of the system: pmdc 1.0ps / √ km, the transmission distance of only 6km in pmdc for 0.5 ps / √ km, the transmission distance only 25km pmdc, 0.2 ps / √ kmTransmission distance of 125km. Thus, pmd to become one of the main factors affecting the transmission distance of high-speed system. Usually the normal use of the support 10Gbit / s high-speed system and 40gbit / s, ultra-high-speed system should ensure that at least the pmdc less than or equal to 0.2 ps / √ km.

You can see from table 1, PMD for low rate has little effect on optical fiber communication system. For 2.5Gbit/s transmission system, dang PMDC for 0.5ps/√ km Shi, can transmission 6,400 km, dang PMDC value for 1ps/√ km Shi, can transmission 1600 km; but for high speed (10Gbit/s) system, transmission distance on sharply shortened, respectively only transmission 100 km and 400 km; for super high speed (40Gbit/s) system 更多：https://www.bmcx.com/ , PMD has serious restricting has system of using: in PMDC for 1.0PS/√ km Shi, Transmission distance of only 6km, when the PMDC as 0.5ps/√ km, transport distance of only 25km, when the PMDC as 0.2ps/√ km,Transmission distance of 125km. Thus, PMD becomes one of the main factors affecting the transmission distance of the high-speed system. Usually high speed system to protect 10Gbit/s and 40Gbit/s ultra high speed system for normal use, should at least guarantee the PMDC 0.2ps/√ km or less.

From table 1 can see, PMD for low rate of the optical fiber communication system the impact is not big. For 2.5 Gbit/s transmission system, when PMDC 0.5 ps/quality indicator km, can travel 6400 km, when PMDC value is 1 ps/appropriate km, can travel 1600 km; But for high speed (10 Gbit/s) system, the transmission distance is greatly shortened,Transmit only 100 km respectively and 400 km; For super-fast (40 Gbit/s) system 更多：https://www.bmcx.com/ , PMD has seriously restricted the use of the system in PMDC 1.0 ps/quality indicator km, the transmission distance only 6 km, in PMDC 0.5 ps/quality indicator km, the transmission distance is only 25 km, in PMDC 0.2 ps/quality indicator km,The transmission distance 125 km. This shows, PMD become influence the high-speed system transmission distance of one of the main factors. For 10 Gbit usually guarantee high speed system/s and 40 Gbit/s ultra-high speed system of the normal use, at least PMDC should ensure that is less than or equal to 0.2 ps/quality indicator km.

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