40km Dispersion Compensation Fiber

In optical fiber communications, dispersion compensation modules (DCM) (also called dispersion compensation units, DCU) can be used for compensating the chromatic dispersion of, e.g., a long span of transmission fiber.

Typically, such a module provides a fixed amount of dispersion (e.g. normal dispersion in the 1.6-μm spectral region), although tunable dispersion modules are also available.

A module can easily be inserted into a fiber-optic link because it has fiber connectors for the input and output. The insertion losses may be compensated with a fiber amplifier, e.g. an erbium-doped fiber amplifier in a 1.5-μm telecom system. A dispersion-compensating module is often placed between two fiber amplifiers.

40km Dispersion Compensation Fiber Dispersion Compensation Principle

Dispersion is one of the transmission properties of the optical fiber, and the optical pulse signal will be broadened in time after transmission in the optical fiber for a distance, which produces inter-symbol interference, thus increasing the error rate and affecting the quality of communication.

The higher the data rate is, the more easily the inter-symbol interference will present.

The longer the transmission distance is, the more easily the inter-symbol interference will present.

40km Dispersion Compensation Fiber Feature

100% slope compensation of G.652 fiber in C-band ( Typical )

Low insertion loss

Low polarization mode dispersion

Wideband dispersion compensation

Compensation up to 40 km

Completely passive—no powering utilized

Telcordia GR-2854-CORE, ROHS compliant

40km Dispersion Compensation Fiber Specification

Product Model DCF40A

Equivalent G.652 compensation length 40km

1545nm wavelength dispersion(ps/nm) -670±30

1545nm wavelength relative dispersion slope 0.004±20%(nm-1)

Insertion loss ≤4.8 dB

Polarization mode dispersion ≤0.9 ps

Nominal single-wave input optical power ≤0 dBm

Optical interface All interfaces are LC type

Typical power consumption 0W (passive components)

MTBF > 200000 hours

Occupied slot number 2 slots (dispersion compensation board over 40km need to be configured individually with the DCF passive frame)

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