Ericsson ECN330 Manuel d'utilisateur télécharger pdf (Page 16)

one to connect the fibers to equipment like routers for example. There are

also Adapters that make it possible to connect two fibers to each other. The

basic parameters for connectors are

1. Insertion loss

If two connectors are connected with an adapter and the loss of the

system is increased by for example 0.3 dB. Then the 0.3 dB is the in-

sertion loss. Typically the value is around 0.2 - 0.5 dB per mated pair.

2. Return loss

Fresnel reflection measure. The power reflected off a connector back

to the light source. Typically around -40 dB.

3. Mating durability

Also known as Insertion loss change. Indicates the increase in Inser-

tion loss after the connector has been connected and disconnected a

number of times. Typically around 0.2 dB per 1000 matings.

4. Operating temperature

Compatible with optic fiber cables. Typically around -25C to +80C.

5. Cable retention

Also known as tensile strength or pull-out loading. The number indi-

cates what kind of load the connector can handle before the fibre is

pulled out of the connection. Typically around 200N.

6. Repeatability

Indicates how consistent the insertion loss is when a joint is discon-

nected and remade. Not always found in specifications because

there is no uniform method of measuring it. Sometimes manufactur-

ers describe repeatability as high or very high. [3]

Some different connector types are shown in Figures 3 and 4.

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Ericsson ECN330 Manuel d'utilisateur Page 16