FTTX Dcm Dispersion Compensation (Fiber) Module for CATV Long Hual Transmission

FWDCM Series  

Dispersion Compensation (Fiber) Module (DCM)

Production Description

At present, 1550nm wavelength high-power analog optical transmission system is the most widely used in HFC cable network. But in the long-distance (≥ 100KM) transmission, the problem of fiber dispersion is very prominent, and the degradation of CSO severely limit the further transmission of the signal. Laser spectral width  as well as fiber dispersion (CDI) ca used by  suppression stimulated Brillouin scattering (SBS) and self-phase modulation (SPM) caused by the fiber nonlinear effect are the most important factors which lead to CSO deterioration.
 

In order to solve the problems result from the dispersion and self-phase modulation effect, the most common method is to use dispersion compensation fiber (DCF) and linear chirped fiber grating (CFG) to compensate dispersion, and (DCM) dispersion compensation modules. The compensation techniques such as commercial-oriented DCF and chirped fiber gratings are mostly used in digital transmission systems.  For analog HFC transmission systems can not copy them.  Such as DCF's ability to compensate dispersion is low, large insertion loss, small diameter of core, strong nonlinear effect, it is not suitable for high-power HFC network transmission. CFG productio n process is very complicated and can only compensate fixed wavelength, flexibility is not enough. DCM module, as a passive component owe wide spectrum has been successfully used in network and achieved good results.

Production Features

1.  Dispersion Compensating Module for optical G652 single mode fiber in transmission links

2.  Improvement of CSO performance of large fiber-optic links 

3.  Very low insertion loss and low PMD