This laser controller is designed for driving the pump laser in optical amplifiers, such as Raman amplifier
and EDFA, with high stability and reliability. It drives the laser in four modes: constant current, constant
laser power, constant output power, and constant gain. It also provides these protection functions: over
current, over laser power, over output power, and over gain.
Interface and Control
Pin #
1
2
3
4
5
6
7
8
9
10
11
Pin
Name
GND
ILIM
OPLIM
LPLIM
GNLIM
LIS
OPS
LPS
GNS
OPFB
OPA
Type
Analog power
Description
Connect ADC and DAC ground to here.
Note
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog input
Analog output
Analog input
Laser current limit set, 0 to 2.5V.
Optical output power limit
set
,
0 to 2.5V.
Laser power limit
set
, 0 to 2.5V.
Constant gain limit
set
, 0 to 2.5V.
Laser current
set
, 0 to 2.5V.
Optical output power
set
, 0 to 2.5V.
Laser output power
set
, 0 to 2.5V.
Constant gain
set
, 0 to 2.5V.
Output photo diode feedback, 0 to 2.5V.
Output photo diode anode, 0 to 2.5V.
12
13
LPFB
LPA
Analog output
Analog input
Laser photo diode feedback, 0 to 2.5V.
Laser photo diode anode, 0 to 2.5V.
14
15
IPFB
IPA
Analog output
Analog input
Input photo diode feedback, 0 to 2.5V.
Input photo diode anode, 0 to 2.5V.
Set by DAC or POT
Set by DAC or POT
Set by DAC or POT
Set by DAC or POT
Set by DAC or POT
Set by DAC or POT
Set by DAC or POT
Set by DAC or POT
Connect a resistor
between these two
pins to set the trans-
impedance
Connect a resistor
between these two
pins to set the trans-
impedance
Connect a resistor
between these two
pins to set the trans-
impedance
16
17
18
19
20
21
22
23
24
2.5V
LPGD
IPO
LPO
OPO
OIO
NC
M1
M2
Analog output
Digital output
Analog output
Analog output
Analog output
Analog output
NC
Digital input
Digital input
Voltage reference, 2.5V.
Loop good, optical amplifier is working at the set
mode.
Input power output voltage, 0 to 2.5V.
Laser power output voltage, 0 to 2.5V.
Output power output voltage, 0 to 2.5V.
Laser current output voltage, 0 to 2.5V.
No connect.
Mode set 1.
Mode set 2. M1M2:
00 = constant current mode,
01 = constant laser power mode,
10 = constant output power mode,
11 = constant gain mode.
To ADC
To ADC
To ADC
To ADC
5 5 0 E . W eddell D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . Tel.: (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W eb: w w w . a n a l o g t e c h n o l o g i e s . c o m
2001 – 2003, Analog Technologies, Inc. All Rights Reserved.
Analog Technologies, Inc.
25
26
27
28
29
30
SDNG
LDA
GND
PGND
PGND
VPS
Digital input
Analog output
Analog power
Power
Power
Power
CWOA-A1-L1-D
Shut down, negative logic: 0 = off.
Laser diode anode.
Analog ground, connect laser diode cathode to here.
Power ground.
Power ground.
Power supply, 3.3V to 5V.
The same as Pin 1.
Specifications
Part number:
Operating temperature range:
Control loop rise and fall time:
Output settling time:
Drive current stability (in current mode):
Output power stability (in power mode):
Output ripple current:
Output current limit setting:
Power supply voltage VPS:
Maximum output current:
Maximum output voltage:
Size:
CWOA-A1-L1-D
-25°C to +85°C
<5uS
<10uS
<0.05%
<0.05%
<0.02%
0 to 0.5A
3.3V to 5.5V
0.5A
VPS – 0.4V
25.5mm
×
22mm
×
4.2mm
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
IPDAN
IPDFB
LPDAN
LPDFB
OPDAN
OPDFB
CGS
LPS
OPS
LIS
CGLM
LPLM
OPLM
LILM
GND
2.5V
LOOPGD
IPWO
LPWO
OPWO
LIO
NC
M1
M2
SDNG
LDAN
GND
PGND
PGND
VPS
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Pin 1
25.5mm
20mm
Figure 1 Bottom View of CWOA-A1-L1-D
Figure 2 Top View of CWOA-A1-L1-D
5 5 0 E . W eddell D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . Tel.: (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W eb: w w w . a n a l o g t e c h n o l o g i e s . c o m
2001 – 2003, Analog Technologies, Inc. All Rights Reserved.
Analog Technologies, Inc.
CWOA-A1-L1-D
4.2mm
0.42mm
18mm
3mm
0.6mm
1.27mm
4.2mm
3.2mm
Figure 3 End View of CWOA-A1-L1-D
1
2
Figure 4 Side View of CWOA-A1-L1-D
3
GND
D
ILIM
OPLIM
LPLIM
CGLIM
LIS
OPS
LPS
CGS
OPFB
OPA
C
LPFB
LPA
IPFB
IPA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
GND
ILIM
OPLIM
LPLIM
GNLIM
LIS
OPS
LPS
GNS
OPFB
OPA
LPFB
LPA
IPFB
IPA
VPS
PGND
PGND
GND
LDA
30
29
28
27
26
25
24
23
22
5 V (Input)
0 V (input)
EDFA Components
D1
IPA
2
1
2.5V
GND
LDA
SDGN
EDFA Input Photodiode
M2
D2
M1
LPA
2
1
2.5V
U1
CWOA-A1-L1-D
SDGN
M2
M1
NC
OIO
OPO
LPO
IPO
LPGD
2.5V
EDFA Laser Photodiode
21
20
19
18
17
16
OIO
OPO
LPO
IPO
LPGD
2.5V
LDA
2
OPA
2
D3
1
2.5V
EDFA Output Photodiode
D4
1
GND
EDFA Laser
IPFB 2.5V LPFB LPA OPFB OPA OPO GNS
2.5V
OPS
LIS
GNLIM
LPILM
OPLIM
ILIM
LPGD
SDNG
M2
M1
1
B
1
1
1
3
3
3
3
3
3
3
R1
10K
2
R2
10K
2
R3
10K
2
R8
300
1
2
2
2
W4
10K
R7
499
2
W5
10K
2
W6
10K
2
W7
10K
2
W8
10K
2
W9
10K
2
W10
10K
D5
LED
S3
SW SPST
S2
SW SPST
S1
SW SPST
2
1
3
3
3
1
1
1
1
1
1
10K
10K
10K
1
1
2
R4
499
R5
499
R6
499
2
2
1
2
1
GND
A
Title
1
W1
W2
1
W3
2
Size
B
Date:
File:
1
2
3
Number
14-Mar-2003
C:\My Documents\Electronic1\Backup of MFLD1
Figure 5 Connecting to EDFA
5 5 0 E . W eddell D riv e , S u ite 4 , S u n n y v a le, C A 9 4 0 8 9 , U . S . A . Tel.: (4 0 8 ) 7 4 7 -9 7 6 0 , F a x : (4 0 8 ) 7 4 7 -9 7 7 0 , W eb: w w w . a n a l o g t e c h n o l o g i e s . c o m
