QDFT Series
High-Sensitivity Transimpedance
pinFET Receiver
I
I
I
I
Fixed transimpedance circuit configuration
Hybrid construction
Industry-standard 14-pin dual-in-line package
Multimode fiber
Description
The Corning Lasertron QDFT pinFET module is a high-sensitivity detector and hybrid
preamplifier module designed for fiber-optic receivers operating at data rates up to and
exceeding 420 Mb/s at 1300 and 1550 nm wavelengths. The transimpedance circuitry
provides excellent sensitivity and superior dynamic range. The high sensitivity results from
use of an advanced GaInAs detector element having <10 nA leakage and a responsivity of
>0.8 A/W at 1300 and 1550 nm.
Sensitivities range from -53 dBm at 18 Mb/s, to -43 dBm at 140 Mb/s. Optical dynamic
range exceeds 25 dB. Operation requires only +5 V power supplies at modest bias currents.
The QDFT is packaged in a hermetically sealed, low-profile, 14-pin DIL package and is
pigtailed with multimode fiber.
Applications
The Corning Lasertron QDFT pinFET module consists of a low-capacitance,
front-illuminated planar detector element followed by a hybrid transimpedance amplifier.
Benefits of the transimpedance design of the QDFT pinFET module include excellent
dynamic range and ease of implementation. The QDFT pinFET requires no equalization
and is self-biasing. Simply by applying +5 V and -5 V supplies to the amplifier circuit, and
a -5 V supply to the detector element, the device is ready to receive an optical input through
a multimode fiber-optic pigtail.
The diagram to the left illustrates the fundamental operation of a QDFT pinFET. As
incident light illuminates the detector, a small signal current is produced which is directly
proportional to the amplitude of the incident light source (P
i
) and the responsivity (R) of
the detector.
This simple relationship of R • P
i
yields the output signal current (I
s
). This current is
then converted to a voltage with the transimpedance resistor (Z
t
) and a gain block amplifier.
The resulting signal voltage (V
s
) is simply derived from the quantities I
s
• Z
t
.
TRANSIMPEDANCE DESIGN CIRCUITRY
Pin Connections
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Detector Bias (-5 V)
NC
Case Ground
-5 V
Case Ground
NC
Output
Case Ground
NC
+5 V
NC
NC
NC
NC
(Bias and interface circuit)
Specifications and Ordering Information
38
2000
QDFT Low-Bandwidth pinFET Receiver, page 39
QDFT Moderate-Bandwidth pinFET Receiver, page 40
QDFT High-Bandwidth pinFET Receiver, page 41
Corning Lasertron 2000 Product Guide
QDFT
Low-Bandwidth
pinFET Receiver
I
Telecom access and junction applications
Description
See page 38 for a general description.
Specifications
QDFT -
Contact Corning Lasertron regarding special requirements.
005 010
10
9
-50.5
-53
500
-25.4
015 020
15
20
9
9
-50.5 -49
-53 -51.5
500
250
-25.4 -22.4
025-001 025-004
25
25
-46.5
-49
250
-22.4
25
25
-48.5
-50.5
360
-25.5
Min
040 045
40
45
25
25
-45
-45
-48
-48
120 120
-19.2 -19.2
Typ
Max
1.5
1
2.3
7
0.85
0.1
90
40
+1
10
Absolute Maximum Ratings
Fiber-coupled power (mW)
Reverse photocurrent (mA)
Reverse bias voltage (V)
Forward current (mA)
Lead soldering temperature (
o
C)
Lead soldering duration (sec)
Fiber yield strength (N, min)
Fiber bend radius (mm, min)
5
5
-15
2
260
10
10
30
5
Min. pinFET bandwidth (MHz)
Min. noise filter bandwidth (MHz)
4
-53
Sensitivity (dBm, Avg.): Max.
Typ.
-55
900
Typ. transimpedance (K Ohm)
Max. input (dBm, Avg.) Min.
-27.9
Common Specifications (all models listed above)
Sensitivity change 25 to 65
o
C (dB)
Gain flatness 10 to 50% of nominal bandwidth (measured into a 1K Ohm load, dB)
Detector dark current (nA)
Output voltage at P
max
(V, p-p)
Measured output impedance (Ohms)
Responsivity 1300 nm and -5 V bias (A/W)
0.75
Responsivity change (dB, 25 to 65
o
C)
Power consumption: +5 V supply (mW)
-5 V supply (mW)
Operating temperature range (
o
C)
-20
Storage temperature range (
o
C)
-40
0.5
70
85
Ordering Information
Base Model
QDFT-005
QDFT-010
QDFT-015
QDFT-020
QDFT-025
QDFT-025
QDFT-040
QDFT-045
No Connector
-001
-001
-001
-001
-001
-004
-001
-001
Suffix
FC/PC
-050
-050
-050
-050
-050
-053
-050
-050
ST
-052
-052
-052
-052
-052
-055
-052
-052
Product
Information/Receivers
2000
and
Detectors
39
QDFT
Moderate-Bandwidth
pinFET Receiver
I
Telecom trunk, access and junction applications
Description
See page 38 for a general description.
Specifications
Absolute Maximum Ratings
Fiber-coupled power (mW)
Reverse photocurrent (mA)
Reverse bias voltage (V)
Forward current (mA)
Lead soldering temperature (
o
C)
Lead soldering duration (sec)
Fiber yield strength (N, min)
Fiber bend radius (mm, min)
5
5
-15
2
260
10
10
30
Contact Corning Lasertron regarding special requirements.
QDFT -
Min. pinFET bandwidth (MHz)
Min. noise filter bandwidth (MHz)
Sensitivity (dBm, Avg.): Max.
Typ.
Typ. transimpedance (K Ohms)
Max. input (dBm, Avg.) Min.
050
50
34
-42.5
-46.8
72
-17
060 065 070 090 100
60
50
-42
-45
72
-17
65
50
-43.5
-46
90
-19
70
50
-42
-44.5
54
-15.8
90 100
90
90
-41
-41
-43
-43
42
42
-14.6 -14.6
Min
Common Specifications (all models listed above)
Sensitivity change 25 to 65
o
C (dB)
Gain flatness 10 to 50% of nominal bandwidth (measured into a 1K Ohm load, dB)
Detector dark current (nA)
Output voltage at P
max
(V)
Measured output impedance (Ohms)
Responsivity 1300 nm and -5 V bias (A/W)
0.75
Responsivity change (dB, 25 to 65
o
C)
Power consumption: +5 V supply (mW)
-5 V supply (mW)
Operating temperature range (
o
C)
-20
o
Storage temperature range ( C)
-40
Typ
1.5
1
2.3
7
0.85
0.1
90
40
Max
+1
10
0.5
70
85
Ordering Information
Base Model
QDFT-050
QDFT-060
QDFT-065
QDFT-070
QDFT-090
QDFT-100
No Connector
-001
-001
-001
-001
-001
-001
Suffix
FC/PC
-050
-050
-050
-050
-050
-050
ST
-052
-052
-052
-052
-052
-052
40
2000
Corning Lasertron 2000 Product Guide
QDFT
High-Bandwidth
pinFET Receiver
I
Telecom access and junction applications
Description
See page 38 for a general description.
Specifications
QDFT -
Contact Corning Lasertron regarding special requirements.
125
125
100
-38.5
-40.5
20
-11.5
170 200 250 275
170
200
150
150
-36.5 -36.5
-38.5 -38.5
11
11
-12
-12
250
200
-34.5
-36.5
6.5
-7.2
275
200
-34.5
-36.5
6.5
-7.2
300
300
200
-34.5
-36.5
6.5
-7.2
Absolute Maximum Ratings
Fiber-coupled power (mW)
Reverse photocurrent (mA)
Reverse bias voltage (V)
Forward current (mA)
Lead soldering temperature (
o
C)
Lead soldering duration (sec)
Fiber yield strength (N, min)
Fiber bend radius (mm, min)
5
5
-15
2
260
10
10
30
Min. pinFET bandwidth (MHz)
Min. noise filter bandwidth (MHz)
Sensitivity (dBm, Avg.): Max.
Typ.
Typ. transimpedance (K Ohms)
Max. input (dBm, Avg.)
Min
Common Specifications
Sensitivity change 25 to 65
o
C (dB)
Gain flatness 10 to 50% of nominal bandwidth (measured into a 1K Ohm load, dB)
Detector dark current (nA)
Output voltage at P
max
(V, p-p)
Measured output impedance (Ohms)
Responsivity 1300 nm and -5 V bias (A/W)
0.75
Responsivity change (dB, 25 to 65
o
C)
Power consumption: +5 V supply (mW)
-5 V supply (mW)
Operating temperature range (
o
C)
-20
Storage temperature range (
o
C)
-40
Typ
1.5
1
2.3
7
0.85
0.1
135
80
Max
+1
10
0.5
70
85
Ordering Information
Base Model
QDFT-125
QDFT-170
QDFT-200
QDFT-250
QDFT-275
QDFT-300
No Connector
-301
-301
-301
-301
-301
-301
Suffix
FC/PC
-350
-350
-350
-350
-350
-350
ST
-352
-352
-352
-352
-352
-352
Product Information/Receivers and Detectors
2000
41
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