Thursday, March 8, 2012
Monday, February 6, 2012
Thursday, January 26, 2012
Repaired EDFA problem
Well we have installed several EDFAs in our RF overlay network here in Islamabad. and these EDFAs are up and running for a number of years now, many of them have started giving problems in their lasers, output ports and other things like this. All of these cards are now out of warranty and we have to pay a handsome amount to get them repaired.
So we kept on thinking on the problems being faced and one major problem was that some output ports reduced output power from its nominal level. We got an idea that if some outputs are giving proper output and other are not, then most probably, the problem is in the pigtail or the connector of that specific port. So we took one Amplifier yesterday and opened it and checked its connector end face by a fiber scope. the connector was damaged.
So we decided to replace the pigtail and guess what, after replacement of the pigtail the problem got resolved. Now we will work on other cards having similar faults and see if we can make them working as well.
So we kept on thinking on the problems being faced and one major problem was that some output ports reduced output power from its nominal level. We got an idea that if some outputs are giving proper output and other are not, then most probably, the problem is in the pigtail or the connector of that specific port. So we took one Amplifier yesterday and opened it and checked its connector end face by a fiber scope. the connector was damaged.
So we decided to replace the pigtail and guess what, after replacement of the pigtail the problem got resolved. Now we will work on other cards having similar faults and see if we can make them working as well.
Thursday, January 5, 2012
Types of Fiber optics
Fiber optics is mainly divided into two types.
1. Single-mode
2. Multi-mode
before discussing these two, it is important to know what is a mode. A mode is a possible path our angle using which light can be sent into a fiber. In other words it can thought of as a light ray passing through the fiber optics.
So by this definition, the single-mode fiber is a fiber which only allows one mode to propagate through its core while on the other hand the multi-mode fiber supports multiple modes in its core. they will off course be travelling at different angles.
Single-mode has a core diameter of 8 to 10 microns (micrometer), while multi-mode has a core diameter of 50 or 62.5 micron. in fact this bigger diameter helps multi-mode to support more than one modes.
then there is another majod difference between single-mode and multi-mode. The wavelengths supported by single-mode are from 1310nm upto 1625nm and those supported by multi-mode are from 850nm to 1300nm.
Single-mode is normally used for longer distances and multi-mode is used for shorter distances.
1. Single-mode
2. Multi-mode
before discussing these two, it is important to know what is a mode. A mode is a possible path our angle using which light can be sent into a fiber. In other words it can thought of as a light ray passing through the fiber optics.
So by this definition, the single-mode fiber is a fiber which only allows one mode to propagate through its core while on the other hand the multi-mode fiber supports multiple modes in its core. they will off course be travelling at different angles.
Single-mode has a core diameter of 8 to 10 microns (micrometer), while multi-mode has a core diameter of 50 or 62.5 micron. in fact this bigger diameter helps multi-mode to support more than one modes.
then there is another majod difference between single-mode and multi-mode. The wavelengths supported by single-mode are from 1310nm upto 1625nm and those supported by multi-mode are from 850nm to 1300nm.
Single-mode is normally used for longer distances and multi-mode is used for shorter distances.
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