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参数资料
| 型号： | 1245CAFC |
| 英文描述： | 1241/1243/1245-Type Uncooled Laser Transmitter |
| 中文描述： | 1241/1243/1245-Type非致冷激光发射器 |
| 文件页数： | 6/12页 |
| 文件大小： | 173K |
| 代理商： | 1245CAFC |
Data Sheet
September 1999
Agere Systems Inc.
3
1241/1243/1245-Type Uncooled Laser
Functional Overview (continued)
1-868(C).h
Figure 1. Simplified Transmitter Schematic Input Data
LASER BACK-FACET MONITOR VOLTAGE
15 k
(2)
(4)
(+)
(–)
15 k
LASER BIAS MONITOR VOLTAGE
15 k
(19)
(17)
(+)
(–)
15 k
BAND GAP
REFERENCE
AUTOMATIC POWER
CONTROL CIRCUITRY
INPUT DATA
COMPARATOR
MODULATION
CIRCUITRY
TEMPERATURE
SENSOR
t
IBF
IBIAS
VCC
LASER
BACK-FACET
DETECTOR
FIBER PIGTAIL
10
DATA
(16)
(7)
(15)
TRANSMITTER
DISABLE
VCC – 1.3 V
30 k
DATA
IMOD
Input Data
Data enters the transmitter through a comparator.
These inputs have internal pull-down resistors to a volt-
age reference that is 1.3 V below VCC. This configura-
tion allows the transmitter to be driven from either a
single-ended or a differential input signal. Since the
input is a comparator instead of a gate, the absolute
input signal levels are not important when the inputs
are driven differentially. When driven single-ended,
however, the input signal voltage should be centered
around VCC – 1.3 V to eliminate pulse-width distortion.
With a single-ended input, either input can be used and
the unused input can be left as an open circuit due to
the internal reference shown in Figure 1. The optical
output signal will be in the same sense as the input
data—an input logic high turns the laser diode on and
an input logic low turns the laser diode off. However, if
the negative input is used with a single-ended data
input signal, the optical signal will be the complement
of the data input signal.
The differental inputs of the 1241 Gbit versions are ter-
minated internally with 100
between the DATA and
DATA inputs.
Minimum Data Rate
Because the modulation and bias control circuitry are
influenced by the input data pattern, the standard
transmitter cannot be used in burst-mode type applica-
tions. For burst-mode applications, please contact your
Agere Account Manager. The minimum data rate
(pseudorandom data, 50% average duty cycle) for the
1241/1243/1245-Type Transmitters is approximately
1 Mbit/s.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 1245CBDC | 制造商:AGERE 制造商全称:AGERE 功能描述:1241/1243/1245-Type Uncooled Laser Transmitter |
| 1245FAFC | 制造商:AGERE 制造商全称:AGERE 功能描述:1241/1243/1245-Type Uncooled Laser Transmitter |
| 1245FBDC | 制造商:AGERE 制造商全称:AGERE 功能描述:1241/1243/1245-Type Uncooled Laser Transmitter |
| 1245G0 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Peripheral IC |
| 1245G1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Peripheral IC |
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