Информатика и выч. техника \ Сетевое программное обеспечение

Optical Wavelength Conversion Unit. STM-64 Transmitting Optical Wavelength Conversion Unit with FEC Function, страница 35

For the optical fiber link made of G.652 optical fiber, because the dispersion coefficient of G.652 optical fiber itself is great, usually a DCM is placed between the multiplexer and the power amplifier, between two levels of line amplifier. For the optical fiber link made of G.655 optical fiber, because its dispersion coefficient is small, usually DCMs should be placed only between multiplexer and the power amplifier. Such a configuration mode mainly prevents the non-linear effect due to too great an incoming fiber power of dispersion compensation fiber from deteriorating the system performance. Besides, this configuration can also minimize the power burden caused to the system.

2. Function

OptiX BWS 320G backbone DWDM optical transmission system adopts multiple types of DCMs, which correspond respectively to different dispersion quantities. Table 3-23 shows the specific parameters of different types of DCMs.


Table 3-23 Specific parameters of DCMs

Parameter

DCM20

DCM40

DCM60

DCM80

Typical compensation distance (km) (upper row of G. 652 optical fibre, lower row of G. 655 optical fibre)

20

40

60

80

80

160

240

320

Dispersion quantity(ps/nm)

(1545nm)

-330(±2%)

-660

(±2%)

-990

(±2%)

-1320

(±2%)

Dispersion slope(ps/nm2)

(min)

-0.876

-1.753

-2.603

-3.471

Insertion loss(dB)

<4

<6

<8

<10

Polarization-mode dispersion(ps)

0.5

0.7

0.8

1.0

Polarization-related loss(dB)

0.1

0.1

0.1

0.1

Working wavelength range(nm)

1525~1565

n  The passive compensation method is simple and feasible.

n  Dispersion compensation fibre is in compliance with the requirements of ITU-T G. 671, G. 692 recommendations and other related recommendations.

n  With 100% (±10%) slope compensation, the insertion loss is low and is not sensitive to the wavelength.

n  Provide DCMs of different compensation distances, which can be configured flexibly according to the actual networking.


Board........................................................................................................................................................................ 1

3.1 Optical Wavelength Conversion Unit................................................................................................................ 1

3.1.1 STM-64 Transmitting Optical Wavelength Conversion Unit with FEC Function........................................... 2

3.1.2 STM-64 Receiving Optical Wavelength Conversion Unit with FEC Function............................................... 6

3.1.3 STM-16 Transmitting Optical Wavelength Conversion Unit....................................................................... 9

3.1.4 STM-16 Receiving Optical Wavelength Conversion Unit......................................................................... 13

3.1.5 Gigabit Ethernet Wavelength Conversion Unit........................................................................................ 16

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