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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-

(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

2GND

3

4GND

5GND

6GND

8GND

9GND

10

GND

11

GND

12

13

GND

14

PIN Bias

15

GND

16

NC