D171-Type
FastLight
PIN Photodetectors
Advance Data Sheet
March 1999
Description
The D171-Type Photodetector consists of a PIN cou-
pled to a multimode fiber pigail. The device is available
in a 4-pin mini-DIL configuration (see Figure 3 and/or
Table 1) and is ideal for long-reach (SONET) and other
high-speed digital applications.
The D171-Type PIN Photodetector is a rear-illuminated
planar diode structure with a low-capacitance active
area for maximum responsivity and speed.
This device incorporates the new Laser 2000 manufac-
turing process from the Optoelectronics Products unit
of Lucent Technologies Microelectronics Group. Laser
2000 is a low-cost platform that targets high-volume
manufacturing and tight product distributions on all
optical subassemblies. This platform incorporates an
advanced optical design that is produced on Opto’s
highly automated production lines. The Laser 2000
platform is qualified for central office and uncontrolled
environments, and can be used for applications requir-
ing high perfomance and low cost.
PIN 2
L
N
PIN 2
R
N
N
C
O
P
C
N
LOAD
C
P
R
P
L
P
PIN 3
1-697
Notes:
This equivalent circuit is intended for modeling the package
capacitance. Minimum capacitance is achieved by connecting the N-
side to ground, applying a negative voltage to the P-side, and allowing
the package to float (i.e., not connected to ground).
Typical values are as follows:
C
O
= 0.3 pF to 0.5 pF.
L
N
, L
P
= 3.0 nH.
R
N
, R
P
= 5
Ω.
C
N
= 0.4 pF.
C
P
= 0.1 pF.
Figure 2. Equivalent ac Circuit for Digital
Applications
10 V
N
LOAD
P
R
BIAS
2
1
PIN 3
Figure 1. Typical Bias Connection
3
4
1-902.a
Figure 3. D171-Type PIN Photodetector Schematic
(Top View)
Table 1. Pin Descriptions
Pin Number
1
2
3
4
Description
NC
Photodiode Cathode
Photodiode Anode
Case Ground
2
Lucent Technologies Inc.
AGERE [ AGERE SYSTEMS ]
