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PDF A1750A Data sheet ( Hoja de datos )

Número de pieza A1750A
Descripción A1750A DWDM Analog Forward-Path or Return-Path Laser Module
Fabricantes Agere Systems 
Logotipo Agere Systems Logotipo



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Data Sheet, Rev. 4
June 2001
A1750A DWDM Analog
Forward-Path or Return-Path Laser Module
Features
s Low adiabatic chirp
s Excellent linearity
s Standard ITU wavelengths
s Advanced analog chip design
s Tested for forward-path or return-path applications
s Reduces equipment requirements in the hub
s Exceeds Telcordia Technologies* 468 specifica-
tion.
Description
The A1750A laser module is a dense wavelength-
division multiplexing laser with a DFB chip designed
specifically for analog RF applications. The device
features low adiabatic chirp to maximize signal qual-
ity in short and long lengths of fiber. The laser’s
excellent inherent linearity minimizes degradation of
the broadcast signals caused by the QAM channels.
Wavelength-division multiplexing (WDM) has gained
widespread acceptance in the telecommunications
market and is being designed into emerging cable
television network architectures. Dense WDM, a
method for delivering targeted QAM signals to differ-
ent locations, allows multiple signal sets to be com-
bined onto a single strand of fiber for transmission
from a headend to a hub. At the hub, individual QAM
signals can be selected and combined with broad-
cast analog channels. The A1750A DWDM laser
module reduces cable network architecture fiber
requirements and lessen equipment requirements in
the hub.
The A1750A is available at a variety of standard ITU
wavelengths. The lasers are offered as either for-
ward-path (40 MHz–860 MHz) or return-path mod-
ules (5 MHz–210 MHz).
Applications
s Networks with limited fiber
s Architectures using separate optical wavelengths
to carry targeted services
* Telcordia Technologies is a trademark of Telcordia Technologies
Inc.

1 page




A1750A pdf
Data Sheet, Rev. 4
June 2001
A1750A DWDM Analog
Forward-Path or Return-Path Laser Module
Electrical Schematics (continued)
CONSTANT
TEC
ALARM
1
THERMISTOR
2
THERMISTOR
dc LASER 3
BIAS
MPD ANODE 4
CASE GROUND
5
MPC CATHODE
6
TEC (+)
7
TEC (–)
39 nH
200
0.01 µf
3.3 µH
1000 pf
0.01 µf
0.01 µf
1000 pf
J2
1 THERMISTOR
2 THERMISTOR
3 dc LASER BIAS
4 MPD ANODE (CASE GROUND)
5 MPC CATHODE
6 TEC (+)
7 TEC (–)
8 GND
9 GND
10 GND
1-1238F.c
Note: When ordering the dc set, the following boards are included: alarm board, 9108-004; TEC board, 9028-004; constant current, 9383-004.
Figure 4. dc Set (Agere Systems-Supplied Option)
Agere Systems Inc.
5

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