Mumbai University > Electronics and Telecommunication > Sem7 > Optical Communication and Networks

Marks: 5M

Year: May 2012

• The international telecommunications union (ITU) has designated six spectral bands for use in optical fiber communications. They are as follows:

1. O band(Original) $ \ \ \ \ \ \ $ 1260-1360nm
2. E band (Extended) $ \ \ $ 1360-1460nm
3. S band (Short) $ \ \ \ \ \ \ \ \ $ 1460-1530nm
4. C band (Conventional) $ \ \ $ 1530-1565nm
5. L band (Long) $ \ \ \ \ \ \ $ 1565-1625nm
6. U band (Ultra long band) $ \ \ $ 1625-1675nm

• O band was the original (first) region used for single mode fiber links.

• Links used can be extended into E band region for fibers with low water content.

• S band consist wavelengths shorter than C band but higher than E band.

• C band is the wavelength region used for conventional Erbium Doped Fiber Amplifier (EDFA).

• L band is longer than C band. In this longer wavelength band, the gain decreases steadily to 1 at 1625nm.

• U band is the region beyond the response capability of an EDFA.