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Optical equipment for cable TV

Optical transmitter ARCOTEL WТ1550 with external modulation

1

 

Purpose:

The reliable, low-noise optical transmitter with the range 1550 nm with the external modulation of optical power. It is made with applying of latest DFB lasers (Distributed Feedback Laser - laser with distributed feedback on the injection laser diode with reflection Bragg grating) providing good nonlinear indicators. Automatic control of amplification at the RF input provides the additional stability in work. It is simple in servicing and controlling. Embedded microprocessor provides convenience in controlling, and display shows all set parameters. The remote control thought embedded RS485 interface is possible. Good operational data and acceptable cost allow to use this model in the cable television network of any complexity.

Technical characteristics:

Parameters

Units of measurement

Value

Optical parameters

Optical wave length

nm

1550±5

Laser type

-

DFB Laser

Modulation type

-

Outer modulation

Socket types

-

FC/APC or SC/APC

Number of outputs

pcs

2

Output power

dBm

≥7

SBS suppression threshold (stimulated [reverse] Brillouin scattering

dBm

13/16/18

HF parameters

Frequency range

MHz

47…862

Input level

dBmkv

75…85

Unevenness in band

dB

±0.75

Input resistance

Ohm

75

Input return losses

dB

≥16 (47-550MHz); ≥14 (550-862MHz)

Socket type

-

F

C/CTB*

dB

≥65

C/CSO*

dB

≥65**

C/N*

dB

≥52

General characteristics

Supply voltage

V

160-250V (50Hz)

Consumed power

W

100

Operation temperature

°С

0…+ 45

Storage temperature

°С

-20…+ 65

Humidity at storage

%

Max.95% (without condensation)

Dimensions

mm

483×381×45

* - at 60 channels PAL, the length of the optical line is 65 km, the input level on the test receiver 0 dBm, there is no more than one amplifier in the line.

** - for output А, for output В - 63 dB.

Structural scheme of the transmitter: 

Структурная схема передатчика