Page 1
R768-Type OC-768/STM-256
Lightweight Receiver
Advance Data Sheet
September 2000
Features
High data rate capability, 40 Gbits/s
■
PIN photodetector
■
Fully operational through the L-band (1.6 µm)
■
wavelength range
Single-mode fiber pigtail with FC/PC optical con-
■
nector
The R768 Receiver is manufactured in a 16-pin, pigtailed surface-mount metal pa ckage with a single - en ded V-con nec t or.
Operating case temperature range:
■
0 °C to 65 °C
Compact, butterfly package
■
Applications
Line terminal e quipment
■
High-speed networks up to 40 Gbits/s
■
SONET OC-768 and SDH S TM-256 telecommuni-
■
cations applications
Extended-reach datacom and telecom applications
■
Digital video
■
Page 2
R768-Type OC-768/STM-256
Lightwei ght R ece iver
Advance Data Sheet
September 2000
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 applications 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 surface-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 connector.
The received data is dc-coupled.
The receiver requires only a 6 V power supply for oper-
ation, plus an optional V
(see pin descriptions). The photodiode requires a separate bias voltage: for the PIN, a nominal reverse bias
of 4 V is required.
ADJUST
from –1.0 V to +1.0 V
Pin Information
Table 1. Pin Descriptions
Pin Number Name
1 Not Used
2GND
3 Alternate P
4GND
5GND
6GND
7V
8GND
9GND
10 GND
11 GND
12 V
13 GND
14 PIN Bias
15 GND
16 NC
ADJUST
Bias
IN
(optional)
CC
2 Agere Systems Inc.
Page 3
Advance Data Sheet
September 2000
R768-Type OC-768 /STM- 256
Lightweight Receiver
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage t o the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other condit ions 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.
Parameter Symbol Min Max Unit
Positive Supply Voltage V
Photodiode Forward Current* I
Maximum Reverse Bias V
Optical Input P ower, PIN P
Operating Case Temperature T
CC
PD
B
MAX
C
5.0 7.0 V
—1 mA
—5V
— 8 dBm
065°C
Storage Temperature Tstg –40 85 °C
Lead Soldering Temperature — — 250 °C
Lead Soldering Time — — 10 s
* Device is normally reverse biased. Forward biasing the photodiode can compromise device perf o rmance and reliability.
Optical Characteristics
Table 2. Optical Characteristics (T
Parameter Symbol Min Typ Max Unit
Optical wavelength for Rated Sensitivity λ 1.480 — 1.610 µm
Sensitivity, PIN P
Maximum Optical Input Power, Average, PIN P
Optical Return Loss — –27 –30 — dBm
Responsivity of PIN
λ = 1.55 µm ℜℜℜℜ
,
Total Dark Current I
Pol arization-dependent Loss PDL — — 0.5 dB
= 25 °C)
A
LOW
HIGH
PIN
D
—–7—dBm
—3—dBm
— 0.7 — A/W
—0.5—µA
Agere Systems Inc. 3
Page 4
R768-Type OC-768/STM-256
Lightwei ght R ece iver
Electrical Characteristics
Advance Data Sheet
September 2000
Table 3. Electrical Characteristics (T
= 25 °C)
A
Parameter Symb ol Min Typ Max Unit
dc Power Supply Voltages:
Positive Supply
PIN Bias
Optional V
ADJUST
Positive dc Power Supply Current I
Power Dissipation P
V
V
V
ADJ
CC
DISS
CC
PIN
5.5
3.5
–1.0
6.0
4.0
—
6.5
4.5
1.0
V
V
V
—80150mA
— — 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
Output Return Loss:
100 kHz—20 GHz
25 GHz—40 GHz
40 GHz—50 GHz
—
—
—
—
22
S
—
—
—
10
20
40
—
—
—
—
—
—
–15
–10
–5
deg
deg
deg
dB
dB
dB
4 Agere Systems Inc.
Page 5
Advance Data Sheet
September 2000
Outline Diagram
Dimensions are in millimeters.
21.440
16.590
1.270
3.890
0.508
R768-Type OC-768/STM-256
Lightweight Receiver
2.375
PIN 1PIN 8
C BORE 3.75 ∅ x 2.30 DP BOTH SIDES
(#4-40 TAP THROUGH ENGLISH)
20.300
15.910
13.480
9.880
1.330
6.380
PIN 9
PIN 16
11.540
29.470
58.400
20.350 14.510
6.600
2.50
6.630
CONNECTOR NOT SHOWN
1-1157(F)
Agere Systems Inc. 5
Page 6
R768-Type OC-768/STM-256
Lightwei ght R ece iver
Ordering Information
Table 4. Ordering Information
Advance Data Sheet
September 2000
Description
R768-Type OC-768/STM-256
Lightwave Receiver
Product C ode Photod iode Connec t or Comcode
R768PGAA PIN FC 108894635
R768PSAA PIN LC 108894643
R768PDAA PIN SC 108727041
R768PJAA PIN Test Ferrule TBD
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 Uni on Boulevard, Room 30L-15P - BA, A llentown, PA 18109-3286
ASIA: Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon
EUROPE: Tel. (44) 7000 624624, FAX (44) 1344 488 045
Agere S ystems I n c. re se rves th e right to m ake changes t o 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 Right s Reserv ed
Printed in U.S.A.
September 2000
DS00-383OPTO-1
1-800-372-2447, F A X 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)
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)
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