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Part: A1750A57FFSC08
Category:
Description: DWDM Analog Forward-path(40MHz-860MHz) Module. Connector SC/APC. Optical Power 8 MW.
Company: Agere Systems
Datasheet: Download A1750A57FFSC08 datasheet File size : 232 kB
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Data Sheet, Rev. 4 June 2001
A1750A DWDM Analog Forward-Path or Return-Path Laser Module
Description
The A1750A laser module is a dense wavelengthdivision multiplexing laser with a DFB chip designed specifically for analog RF applications. The device features low adiabatic chirp to maximize signal quality 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 different locations, allows multiple signal sets to be combined 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 broadcast 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 forward-path (40 MHz860 MHz) or return-path modules (5 MHz210 MHz).
Features
s s s s s s s
Low adiabatic chirp Excellent linearity Standard ITU wavelengths Advanced analog chip design Tested for forward-path or return-path applications Reduces equipment requirements in the hub Exceeds Telcordia Technologies* 468 specification.
Applications
s s
Networks with limited fiber Architectures using separate optical wavelengths to carry targeted services
* Telcordia Technologies is a trademark of Telcordia Technologies Inc.
A1750A DWDM Analog Forward-Path or Return-Path Laser Module
Data Sheet, Rev. 4 June 2001
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Parameter* Operating Case Temperature Range Storage Temperature Range Monitor Photodiode Reverse Voltage Laser Forward Current Reverse Voltage (Laser) TEC Current RF Input Power Symbol TC Tstg VMPD IF VR ITEC PRFIN Min 25 40 -- -- -- 1.5 -- Max 65 70 10 150 2 1.5 62 Unit °C °C V mA V A dBm V
* The device can withstand continuous exposure to the specified limits without damage.
Characteristics
Table 1. Key Characteristics Parameter Frequency Range: Return Path Forward Path Frequency Response:1 5 MHz--210 MHz 40 MHz--860 MHz RF Return Loss:1 5 MHz--210 MHz 40 MHz--860 MHz Optical Output Power Laser Relative Intensity Noise Composite Second Order 2, 3 Composite Triple Beat 2, 4 Available Wavelengths5 Wavelength Drift6
1
Symbol F
Conditions --
Min 5 40
Typ -- -- ±0.5 ±0.5 >16 >16 -- < 155 < 50 < 60 -- --
Ma x 210 860 -- -- -- -- -- -- -- -- 1563 0.04
Unit M Hz M Hz dB dB dB dB mW dB/Hz dBc dBc nm nm
|S21|
IF = 60 mA, TOP = 25 °C, IF = 60 mA,
|S21|
-- -- --
PO RIN CS O CTB OP
IF = IOP IF = ITH + 70 mA, T = 25 °C IF = IOP OMI = 10% , IF = IOP OMI = 10% , IP = IOP T = TOP , IF = 60 mA, T = TOP, TC varied from min-->max IF = 60 mA, TOP = 25 °C, measured at 500 MHz IF = IOP
6, 8, or 10 -- -- -- 1528 --
Adiabatic Chirp
FM
40
--
100
MHz/mA
Operating Case Temperature Range
TC
20
--
65
°C
1. Tested in a 50 system with 27 series matching resistor. 2. Eight-channel loading, 10% OMI, 40 km fiber. 3. Measured at 42 MHz. 4. Measured at 553.25 MHz, 577.25 MHz. and 595.25 MHz. 5. Consult an Agere Systems account manager for other wavelengths. 6. Change in wavelength as case temperature is changed.
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Agere Systems Inc.
Data Sheet, Rev. 4 June 2001
A1750A DWDM Analog Forward-Path or Return-Path Laser Module
Characteristics (continued)
Table 2. Additional Characteristics Parameter Bias Current (Operating Current) Threshold Current Slope Efficiency2 Monitor Photocurrent Operating Chip Temperature3 TEC Current
1
S ymbol IB IT H IMON TOP ITEC
Conditions BOL 25 °C, BOL IP = ITH + 20 and ITH + 60 IOP = 0 mA, VRM = 5 V, TOP = 25 °C IF = IOP 20 °C < TC < 65 °C, TOP = 15 °C--35 °C, IF = 60 mA TOP = 15 °C--35 °C over TC TOP = 25 °C TC IF = IOP
Min -- -- 0.10 10 15 1.5
Max 120 30 -- 200 35 1.5
Unit mA mA mW/mA µA/mW °C A
TEC Voltage Thermistor Resistance Optical Return Loss Side Mode Suppression Ratio
VTEC RTH O RL SMSR
2 9.5 40 30
2 10.5 -- --
V k dB dB
1. Bias point at which all specifications apply. 2. For 10 mW output power. Minimum slope efficiency is lower for lower power lasers. 3. Chip temperature at which wavelength specification is met. Operating chip temperature is reported for each laser.
Electrical Schematics
1 ISOLATOR 2 NC
14
13
(+)
3
12
()
()
4
11
(+)
(+)
5 NC
10
(+)
6
CASE GROUND CASE GROUND
9
()
7 TEC
8
1-1233F
Figure 1. A1750A Laser Schematic
Agere Systems Inc.
3
A1750A DWDM Analog Forward-Path or Return-Path Laser Module
Data Sheet, Rev. 4 June 2001
Electrical Schematics (continued)
14 NC 13 LASER COMMON (+) LASER MODULATION () LASER COMMON (+) THERMISTOR
1
2 THERMISTOR 3 200 4 SEE FIGURE 4 3.3 µH 39 nH 0.01 µf
SEE FIGURES 3A AND 3B
12
dc LASER BIAS MPD ANODE CASE GROUND
11
10 NC 9 MPC CATHODE
5
1000 pf
CASE GROUND CASE GROUND
6 TEC (+) 7 TEC () 0.01 µf 0.01 µf
1000 pf
8
1-1238F
Figure 2. A1750A Circuit Schematic
0.01 µf C7 3:5 T1* 2 3 SEE PIN 12, FIGURE 2 0.5 pF--2.5 pF V SW R
R1 37.5
SEE PIN 12, FIGURE 2 R2 37.5
1-1238F.b
1 pF-- 5 pF FREQUENCY RESPONSE * T1 (75 ) 3:5.
0.01 µf
0.01 µf
Figure 3b. Resistive-Matched Configuration
1-1238a(F)
Figure 3a. Impedance-Matched Configuration
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Agere Systems Inc.
Data Sheet, Rev. 4 June 2001
A1750A DWDM Analog Forward-Path or Return-Path Laser Module
Electrical Schematics (continued)
TEC CONSTANT A LARM
1 THERMISTOR 2 THERMISTOR 3 200 4 1000 pf 5 MPC CATHODE 1000 pf 6 TEC (+) 0.01 µf 7 TEC () 0.01 µf
1-1238F.c
J2
39 nH 0.01 µf
dc LASER BIAS MPD ANODE CASE GROUND
3.3 µH
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
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.
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