Advance Data Sheet
September 2000
R768-Type OC-768/STM-256
Lightweight Receiver
The R768 Receiver is manufactured in a 16-pin, pigtailed sur-
face-mount metal package with a single-ended V-connector.
Features
s
High data rate capability, 40 Gbits/s
s
PIN photodetector
s
Fully operational through the L-band (1.6 m)
wavelength range
s
Single-mode fiber pigtail with FC/PC optical con-
nector
s
Operating case temperature range:
0 C to 65 C
s
Compact, butterfly package
Applications
s
Line terminal equipment
s
High-speed networks up to 40 Gbits/s
s
SONET OC-768 and SDH STM-256 telecommuni-
cations applications
s
Extended-reach datacom and telecom applications
s
Digital video
2
Agere Systems Inc.
Advance Data Sheet
September 2000
Lightweight Receiver
R768-Type OC-768/STM-256
Description
Receiver Operation
The R768 40 Gbits/s fiber-optic receiver consists of a
high-speed photodetector (PIN) and a wide-band linear
preamp in a pigtailed surface-mount metal package
with a single-ended V-connector. It is designed for use
in single-mode, high-speed telecommunication applica-
tions at the SONET OC-768 and the ITU-T SDH
STM-256 data rate of 42.5 Gbits/s.
The operating case temperature range for the receiver
is 0 C to 65 C.
The receiver is manufactured in a compact, 16-pin sur-
face-mount package with a single-mode optical fiber
pigtail. The fiber pigtail is internally beveled for low
return loss and is available with an FC-PC optical con-
nector.
The received data is dc-coupled.
The receiver requires only a 6 V power supply for oper-
ation, plus an optional V
ADJUST
from 1.0 V to +1.0 V
(see pin descriptions). The photodiode requires a sep-
arate bias voltage: for the PIN, a nominal reverse bias
of 4 V is required.
Pin Information
Table 1. Pin Descriptions
Pin Number
Name
1
Not Used
2
GND
3
Alternate P
IN
Bias
4
GND
5
GND
6
GND
7
V
ADJUST
(optional)
8
GND
9
GND
10
GND
11
GND
12
V
CC
13
GND
14
PIN Bias
15
GND
16
NC
Advance Data Sheet
September 2000
Lightweight Receiver
R768-Type OC-768/STM-256
Agere Systems Inc.
3
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operations section of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
* Device is normally reverse biased. Forward biasing the photodiode can compromise device performance and reliability.
Optical Characteristics
Parameter
Symbol
Min
Max
Unit
Positive Supply Voltage
V
CC
5.0
7.0
V
Photodiode Forward Current*
I
PD
--
1
mA
Maximum Reverse Bias
V
B
--
5
V
Optical Input Power, PIN
P
MAX
--
8
dBm
Operating Case Temperature
T
C
0
65
C
Storage Temperature
Tstg
40
85
C
Lead Soldering Temperature
--
--
250
C
Lead Soldering Time
--
--
10
s
Table 2. Optical Characteristics (T
A
= 25 C)
Parameter
Symbol
Min
Typ
Max
Unit
Optical wavelength for Rated Sensitivity
1.480
--
1.610
m
Sensitivity, PIN
P
LOW
--
7
--
dBm
Maximum Optical Input Power, Average, PIN
P
HIGH
--
3
--
dBm
Optical Return Loss
--
27
30
--
dBm
Responsivity of PIN
,
= 1.55
m
PIN
--
0.7
--
A/W
Total Dark Current
I
D
--
0.5
--
A
Polarization-dependent Loss
PDL
--
--
0.5
dB
Advance Data Sheet
September 2000
Lightweight Receiver
R768-Type OC-768/STM-256
4
Agere Systems Inc.
Electrical Characteristics
Table 3. Electrical Characteristics (T
A
= 25 C)
Parameter
Symbol
Min
Typ
Max
Unit
dc Power Supply Voltages:
Positive Supply
PIN Bias
Optional V
ADJUST
V
CC
V
PIN
V
ADJ
5.5
3.5
1.0
6.0
4.0
--
6.5
4.5
1.0
V
V
V
Positive dc Power Supply Current
I
CC
--
80
150
mA
Power Dissipation
P
DISS
--
--
0.975
W
Conversion Gain
--
--
60
--
V/W
Average Equivalent Input Noise Spectral Density
--
--
--
50
pA/
Hz
Low Frequency Cutoff (3 dB)
f
L
--
100
--
kHz
Bandwidth
BW
--
45
--
GHz
Rolloff (3 dB + 5 GHz)
--
--
10
--
dB
Peaking
--
--
--
2
dB
Deviation from Linear Phase:
100 kHz--25 GHz
25 GHz--40 GHz
40 GHz--50 GHz
--
--
--
--
10
20
40
--
--
--
deg
deg
deg
Output Return Loss:
100 kHz--20 GHz
25 GHz--40 GHz
40 GHz--50 GHz
S
22
--
--
--
--
--
--
15
10
5
dB
dB
dB
Advance Data Sheet
September 2000
Lightweight Receiver
R768-Type OC-768/STM-256
Agere Systems Inc.
5
Outline Diagram
Dimensions are in millimeters.
13.480
15.910
20.300
0.508
1.270
3.890
16.590
21.440
C BORE 3.75
x 2.30 DP BOTH SIDES
(#4-40 TAP THROUGH ENGLISH)
2.375
1.330
11.540
29.470
PIN 9
PIN 16
PIN 1
PIN 8
58.400
20.350
14.510
6.630
6.600
2.50
CONNECTOR NOT SHOWN
9.880
6.380
1-1157(F)
Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liabi lity is assumed as a result of their use or application. ST is a
registered trademark of Agere Systems Inc.
Copyright 2001 Agere Systems Inc.
All Rights Reserved
Printed in U.S.A.
September 2000
DS00-383OPTO-1
For additional information, contact your Agere Systems Account Manager or the following:
INTERNET:
http://www.agere.com
E-MAIL:
docmaster@agere.com
N. AMERICA:
Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286
1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)
ASIA:
Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon
Tel. (852) 3129-2000, FAX (852) 3129-2020
CHINA: (86) 21-5047-1212 (Shanghai), (86) 10-6522-5566 (Beijing), (86) 755-695-7224 (Shenzhen)
JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 778-8833, TAIWAN: (886) 2-2725-5858 (Taipei)
EUROPE:
Tel. (44) 7000 624624, FAX (44) 1344 488 045
Advance Data Sheet
September 2000
Lightweight Receiver
R768-Type OC-768/STM-256
Ordering Information
Table 4. Ordering Information
Description
Product Code
Photodiode
Connector
Comcode
R768-Type OC-768/STM-256
Lightwave Receiver
R768PGAA
PIN
FC 108894635
R768PSAA
PIN
LC
108894643
R768PDAA
PIN
SC
108727041
R768PJAA
PIN
Test Ferrule
TBD
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