Fiber Optic Business Unit
Tyco Electronics/LDI
2 Olsen Avenue
Edison, New Jersey 08820 USA
Voice: 732-549-9001
Fax: 732-906-1559
Internet: www.laserdiode.com
E-mail: sales@laserdiode.com
Laser Diode Incorporated
PINFET
optical receiver modules
High sensitivity
High overload power
Wide dynamic range
850, 1310, 1550nm operation
Hermetic package
Custom bandwidths available
The Laser Diode Incorporated PINFET provides an excellent solution for optical
receiver systems that require both high sensitivity and wide dynamic range.
Applications include telecommunications line-terminating equipment or
repeaters and optical sensor systems. The receiver package offers high
reliability satisfying Telcordia specifications.
The term "PINFET" (p-intrinsic-n, field-effect transistor) indicates the integration
of a PIN photodiode and a discrete, high-performance transimpedance
amplifier stage. Light is coupled into the detector stage through a multimode
optical fiber pigtail, which allows excellent coupling with either singlemode or
multimode fiber systems.
10-4400-0008 Rev. B
Specifications and Limits
Performance @ 25
O
C
(+/- 5.0 VDC)
Minimum
1
Bandwidth
(MHz)
4
12
24
32
65
120
250
3
12
24
36
65
110
4
12
24
32
65
120
250
Suggested
2
Data Rate
(Mb/s)
6
17
34
45
90
168
350
4
17
34
52
90
155
6
17
34
45
90
168
350
Sensitivity
3
(dBm)
min typ
-54 -56
-51 -53
-48 -50
-47 -49
-43 -45
-40 -42
-35 -37
-54
-50
-48
-46
-41
-38
-51
-48
-44
-43
-38
-34
-29
-56
-52
-50
-48
-43
-40
-56
-52
-50
-48
-43
-40
-31
Transimpedance
Dynamic
Range (dB)
(Kohms)
typ
typ
25
1100
25
740
25
340
25
210
25
80
25
40
25
10
53
49
47
45
40
37
25
25
25
25
25
25
25
1100
350
340
210
60
30
1100
740
340
210
80
40
10
LDPF Series
LDPF 0004
LDPF 0012
LDPF 0024
LDPF 0032
LDPF 0065
LDPF 0120
LDPF 0250
LDPW 0003
LDPW 0012
LDPW 0024
LDPW 0036
LDPW 0065
LDPW 0110
LDSF 0004
LDSF 0012
LDSF 0024
LDSF 0032
LDSF 0065
LDSF 0120
LDSF 0250
LDPW Series
InGaAs detectors
mounted on ceramic
submounts for use in
PINFET products
LDSF Series
Laser Diode's standard PINFETs use a
low dark current, Indium Gallium
Arsenide (InGaAs) PIN photodiode
with high responsivity between
wavelengths of 1100nm and
1600nm (higher wavelengths also
available). The detector is mounted
directly onto a hybrid circuit
assembly for optimum signal
performance. In addition, low-noise
MESFETs are used in the amplifier
stages to further enhance device
performance. The fiber pigtail is
actively aligned with the detector
and soldered in place to provide a
highly stable coupling mechanism.
The LDPF series PINFET receiver is
LDI's highest sensitivity product. The
sensitivity is maximized at a
particular bandwidth that may be
selected from our standard offering
or can be defined by the customer
for high volume applications. This
product contains no automatic gain
control (AGC) so the dynamic range
is limited to 25 dB.
The LDPW series PINFET includes
AGC and has been optimized for
wide dynamic range operation (up to
0 dBm)while maintaining a very high
sensitivity level.
Common Characteristics @ 25
O
C
Units
Dark current @ -5 V
Maximum optical input @ -5 V
Sensitivity derating over operating
temperature
InGaAs detector responsivity
1300 nm
1550 nm
Si detector responsivity
850 nm
Maximum output signal level
Output impedance
Load impedance
Supply voltage
Power supply current +5 V
Power supply current -5 V
nA
dBm
dB
A/W
A/W
V
pp
Ohms
Ohms
V
mA
mA
-
2.5
10
1000
4.5
25
10
5.5
35
15
4.5
25
10
-
0.8
10
1000
5.5
35
15
4.5
25
10
0.50
2.5
10
1000
5.5
35
15
LDPF Series
min typ max
0.50
<1
0.9
0.95
1
-3
Sensitivity Level
(dBm) +25dB
LDPW Series
min typ max
0.50 1
0
<1
0.9
0.95
LDSF Series
min typ max
0.50
<1
-
-
1
Sensitivity Level
(dBm) +25dB
Fiber Specifications
Fiber type
Multimode
tight buffer
Index Profile N/A
Graded
Nominal Size
(um)
Cladding
Tolerance
900 um Buffer Fiber Yield Fiber Bend
Strength Radius min.
Material
(N)
(mm)
Hytrel
10
30
0.2
50/125/245/900
125 +/-2.0 um
Other fiber types are available. Please contact the Laser Diode Sales Department or your local Laser Diode representative.
Absolute Maximum Ratings
Units
Operating temperature
Storage temperature
Positive supply voltage
Negative supply voltage
Detector bias
Soldering time at 260
o
C
o
C
LDPF Series
-40 to 70
-40 to 85
7
-7
-20
10
C
V
V
V
secs
o
LDPW Series
-40 to 70
-40 to 85
7
-7
-20
10
LDSF Series
-40 to 70
-40 to 85
7
-7
-20
10
Notes:
1. Bandwidth is measured at the -3 dB point.
2.
A given bandwidth will typically support an NRZ data rate of 1.4 times the 3 dB bandwidth.
3. Sensitivity is calculated using the noise voltage measured at 25
o
C at the output of a 3-pole Butterworth filter
whose bandwidth equals that of the PINFET’s minimum specified bandwidth. Sensitivity is specified as the
average optical power in dBm measured at 1300nm and Ta = 25
o
C for a BER of 10
-9
.
10-4400-0008 Rev. B
Outline Drawing
1.0 meter nominal fiber length
0.38
[9.5]
0.19
[4.7]
0.75 [19.1]
0.21
[5.2]
0.10 [2.51]
O 0.018 [0.46]
Connector, optional
0.50
[12.7]
0.30
[7.6]
C
L
Characteristic testing
of PINFET receivers.
Application Notes:
1.
Laser Diode's standard or custom bandwidth tuned
products offer optimized sensitivity at the specified
bandwidth. A PINFET essentially operates as an analog
receiver. However, in the great majority of applications,
they are used to receive digital information. A given
bandwidth will typically support an NRZ data rate of 1.4
times the specified 3 dB bandwidth.
2. Sensitivity is the minimum optical input power required
to achieve a targeted bit error rate (BER). Sensitivity is
determined by measuring the noise voltage at the
output of a 3-pole Butterworth filter with a bandwidth
equal to the minimum required bandwidth. Sensiti-
vity is calculated by using the noise voltage value in
the following equation:
K V
n
Sensitivity (dBm) = 10 log
T
g
where:
K is a constant determined by the target BER,
i.e.
10
-9
6.0
10
-10
6.4
BER K
0.82 [20.8]
0.10 [2.54]
Pin Assignments
Pin
1
2,6,9,11
12,13,14
3,5,8
4
7
10
Function
-5 V detector bias
no connection
no connection
ground
-5 volts
output
+5 volts
Functional Diagram - LDPF Series Receiver
+5V
Pin 10
Fiber Pigtail
V
n
is the noise voltage in millivolts.
T
g
is the transfer gain in V/W. It is defined as
the voltage out per unit of optical power into
the PINFET. This can be calculated using:
T
g
= Responsivity (A/W multiplied by
Transimpedance (ohms).
3. To calculate the output voltage (peak-to-peak) of a
PINFET, use the following equation:
where:
V
out
= 2 P
in
x T
g
Pin 1
-5V
Pin 4
-5V
Pins
3,5,8
Pin 7
Output
Typical Interface - LDPF, LDPW, and LDSF Series
+5V
2.2K
Ω
0.1 µF
0.1 µF
P
in
is the average optical input power in watts.
T
g
is defined in 2 above.
4. When designing a receiver using LDI's transimpedance
PINFETs, the following practices should be observed:
a. Match the output impedance to 1 Kohm. A
suitable schematic is shown herein.
b. For maximum stability, use a low impedance
ground return in your design.
c. If your voltage supply lines are susceptible to
noise, use a full LC filter close to the PINFET
module.
0.1 µF
TOP
VIEW
LDPF
LDPW
LDSF
-5V
2.2K
Ω
0.1 µF
330
Ω
1
0.1 µF
14
0.1 µF
Photodetector
bias (-5V)
10-4400-0008 Rev. B
PINFET
optical receiver modules
2 Olsen Avenue
Our Sites
in
Edison, New Jersey
Product Changes
Laser Diode Incorporated reserves the right to make changes to the product(s) or
information contained herein without notice. No liability is assumed as a result of
their use or application.
Handling Precautions
Handle optical fiber with normal care, avoiding stretch, tension, twist, kink or
bend abuse. Products are subject to the risks normally associated with sensitive
electronic devices including static discharge, transients, and overload.
4 Olsen Avenue
Ordering
Products can be ordered directly from Laser Diode Incorporated or its representatives. When ordering, refer to the model numbers below.
For a complete listing of representatives, visit our website at www.laserdiode.com.
Special Orders
Some products can be supplied with performance characteristics to meet unique customer requirements and differ from those indicated
herein. Contact the Laser Diode Incorporated Sales Department or your local representative to discuss your individual requirements. For a
complete listing of representatives, visit our website at www.laserdiode.com.
Model Numbers
Using the performance tables in this document, select a series and a bandwidth within the series and use the following numbers to order:
LDPF Series
High Sensitivity
LDPF 0004XX
LDPF 0012XX
LDPF 0024XX
LDPF 0032XX
LDPF 0065XX
LDPF 0120XX
LDPF 0250XX
LDPW Series
Wide Dynamic Range
LDPW 0003XX
LDPW 0012XX
LDPW 0024XX
LDPW 0036XX
LDPW 0065XX
LDPW 0110XX
LDSF Series
850nm Operation
LDSF 0004XX
LDSF 0012XX
LDSF 0024XX
LDSF 0032XX
LDSF 0065XX
LDSF 0120XX
LDSF 0250XX
Note:
To indicate the pigtail connector termination you require, substitute one of the following designations for "XX" in the above table:
No suffix indicates no connector.
Use
FC
to indicate an FC/PC type connector.
Use
LC
to indicate an LC/PC type connector.
Use
SC
to indicate an SC/PC type connector.
Use
ST
to indicate an ST
®
type connector.
Fiber Optic Business Unit
Tyco Electronics/LDI
2 Olsen Avenue
Edison, New Jersey 08820 USA
Voice: 732-549-9001
Fax: 732-906-1559
Internet: www.laserdiode.com
E-mail: sales@laserdiode.com
Laser Diode Incorporated
10-4400-0008 Rev. B
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