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参数资料
| 型号： | 1245FAFC |
| 厂商： | TRIQUINT SEMICONDUCTOR INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | TRANSMITTER |
| 封装： | PLASTIC, DIP-20 |
| 文件页数： | 5/12页 |
| 文件大小： | 201K |
| 代理商： | 1245FAFC |
2
Lucent Technologies Inc.
Data Sheet
1241/1243/1245-Type Uncooled Laser Transmitter
September 1999
Description
The 1241/1243/1245-type Laser Transmitters are
designed for use in transmission systems and high-
speed data communication applications. Used in
intraofce and intermediate-reach applications, the
transmitters are congured to operate at SONET rates
up to OC-12, as well as at ITU-T synchronous digital
hierarchy (SDH) rates up to STM-4. Specic versions
are also capable of operating up to 1062.5 Mbits/s.
The transmitter meets all present Bellcore GR-253-
CORE requirements, ANSI T1.117-1991 SONET sin-
gle-mode, and the ITU-T G.957 and G.958 recommen-
dations. (See Table 5 to select transmitters for the
various SONET/SDH segments.)
The transmitter requires a single power supply (+5 V or
–5 V) and operates over data rates of 1 Mbits/s to
622 Mbits/s (NRZ). Automatic power control circuitry
provides constant optical output power over the operat-
ing case temperature range. The automatic power con-
trol circuitry also compensates for laser aging. The
optical wavelength tolerance at 25
°C is 1310 nm. The
temperature coefcient of wavelength for 1.3
m Fabry-
Perot transmitters (1241-Type) is approximately
0.4 nm/
°C. The temperature coefcient of wavelength
for 1.3
m and 1.55 m distributed-feedback (DFB)
transmitters (1243/1245-Type) is approximately
0.1 nm/
°C.
Transmitters are available for operation over several dif-
ferent temperature ranges from –40
°C to +85 °C. Man-
ufactured in a 20-pin DIP, the transmitter consists of a
hermetic, InGaAs laser and a single CMOS driver IC.
The low-power consumption circuit provides modula-
tion, automatic optical output power control, and data
reference. The module can be driven by either ac- or
dc-coupled data in single-ended or differential congu-
ration. (See Recommended User Interfaces section for
typical connection schemes.) The laser bias and back-
facet monitor currents are electrically accessible for
transmitter performance monitoring. The transmitter
optical output may be disabled by a logic-level input.
Functional Overview
Transmitter Circuit Description and
Operation
Figure 1 shows a simplied schematic of the transmit-
ter; pin information is listed in Table 1. The laser within
the transmitter is driven by a single CMOS integrated
circuit, which provides the input data signal reference
level with automatic, temperature-compensated laser
bias, and modulation-current control. A back-facet pho-
todetector diode within the laser module provides an
indication of the laser's average optical output power.
The back-facet diode current is accessible as a voltage
proportional to photocurrent through pins 17 and 19 on
the transmitter. The back-facet diode also forms part of
the feedback control circuit, which helps maintain con-
stant output power.
The laser bias current is accessible as a dc-voltage by
measuring the voltage developed across pins 2 and 4
of the transmitter. Dividing this voltage by 10
will
yield the value of the laser bias current. This value will
change up or down in response to operating tempera-
ture, power supply voltage, data pattern, and laser
aging characteristics.
Table 1. Pin Descriptions
* Pins designated as no user connection should not be tied to
ground or any other circuit potential.
Laser back-facet and bias monitor functions are customer-use
options that are not required for normal operations of the trans-
mitter. They are normally used during manufacture and for
diagnostics.
Pin Number
Name
1
No user connection*
2
Laser bias monitor (+)
3
No user connection*
4
Laser bias monitor (–)
5VEE
6VCC
7
Transmitter disable
8VCC
9VCC
10
No user connection
11
Case ground (RF ground)
12
VCC
13
Case ground (RF ground)
14
VEE
15
DATA
16
DATA
17
Laser back-facet monitor (–)*
18
VCC
19
Laser back-facet monitor (+)*
20
No user connection
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| 1245G2 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Peripheral IC |
| 1245M0 | 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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