參數(shù)資料
型號(hào)： SML2120
廠商： Summit Microelectronics, Inc.
英文描述： Programmable Adaptive Laser Power Controller with Dual Lookup Tables
中文描述： 可編程控制器自適應(yīng)激光功率雙查找表
文件頁(yè)數(shù)： 2/32頁(yè)
文件大?。?/td> 1196K
代理商： SML2120
Functional Description
SML2120
2
2066 6.3 1/22/04
Summit Microelectronics
–\
FUNCTIONAL DESCRIPTION
The SML2120 is an adaptive power controller for laser
diodes. The device contains an active feedback loop used
to calibrate and control the mean and modulation power of
high-speed high-power laser diodes.
Inherent manufacturing tolerances introduce variations of
performance in laser diodes. These variations, combined
with parametric changes over the laser's extreme operating
temperature range and laser aging, require an efficient
compensation solution. The SML2120, together with a
minimum number of external components, is designed to
compensate for these variations using a digital control loop
and dual programmable nonvolatile calibration lookup
tables.
Figure 2 shows the output light power of a typical laser
diode versus its operating current. Depicted in the graph are
laser diode characteristics at two different temperatures. At
the first temperature (T
Cold
), the laser requires an average
bias current of I
BIAS1
. The modulation current required to
switch the laser between its ON and OFF states is labeled
I
MOD1
.
The ratio of light power of its ON state divided by the light
power of its OFF state is referred to as the extinction ratio.
Ideally the laser requires a constant extinction ratio over its
entire operating temperature range, as the receiver module
is calibrated to this level. Operating the laser driver at a
higher extinction ratio indicates that power is being wasted,
whereas operating at a lower extinction ratio indicates that
data may possibly be lost.
The required bias current increases to I
BIAS2
when the laser
is operated at a second temperature (T
Hot
). The laser
requires a modulation of I
MOD2
to maintain a constant
extinction ratio as in the T
Cold
curve. The SML2120, with its
dual lookup table architecture (Figure 3), is capable of
providing variable output currents based on a function of
either the bias current or the external temperature, and
thereby enables the system designer to optimize the
extinction ratio of the laser driver module.
The SML2120 eliminates the need for any manual
calibration of the laser control circuit. All calibration values
are programmed through the I
2
C industry-standard 2-wire
communication interface whose protocol and functions can
be controlled by automated test equipment (ATE).
Figure 2. Laser Current Increase Caused by Temperature Increase, Constant Light Power Out
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