參數(shù)資料
型號： AK2572
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： APC for Burst Mode Applicable Direct Modulation Laser Diode
中文描述： apc的突發(fā)模式適用的直接調(diào)制激光器
文件頁數(shù)： 30/50頁
文件大?。?/td> 463K
代理商： AK2572
ASAHI KASEI
[AK2572]
-30-
< MS0290-E-01>
2004/8
8.
Start-Up Setting in SFP Support Mode
8.1
TXFAULT Detection at Power-Up and after Release from Shutdown
8.1.1 OPTALM
In SFP support mode setting (RE_SFP_SET
＝
”0”), a mask time can be programmed for TXFAULT detection by
OPTALM during the shutdown release so that a time constant delay derived from the external Rpd and Cpd for
detection of the averaged monitor-PD current at the turning-on of LD must be taken into consideration. Block
diagram in Figure 8-1, and pre-settable mask time relation in Table 8-1 are shown.
In the AK2572, the delay time can be shortened by accelerated start-up setting which is made by initial value
setting function of R_APC_FB and so on.
But when OPTALM is selected as one of the TXFAULT target ALMs, and a mask time is set to be shortened, be
noted that LD optical power will not reach the expected level within the mask time and it may be shutdown
through OPTALM detection to TXFAULT control sequence if initial set value of APC_FF or APC_FB is far off.
Figure 8-1 OPTALM Detection Block Diagram
TXFAULT
CONTROL
APC Feedback value (R_APC_FB)
PDGAIN
Monitor
PD
DIGITAL
FILTER
APC target
(R_APC_TRGT)
OPTALM
_COMP
OPTALM threshold
(optalm_ref)
PDIN
Rpd
Cpd
DAC_APC
ATT
vpd
vapc_ref
APC_
COMP
OPALM setting
(R_OPTALM)
PDGAIN setting
(RE_PDGAIN)
LD
A time constant delay at
shutdown release derived
from the external Rpd and
Cpd must be taken into
consideration
Table 8-1 Time to Valid TXFAULT Detection by OPTALM
RE_
SFP_SET
_OPTALM
INIT_SET
0
RE_TIMER
RE_APC_
RE_APC
_FF_SET
x
00, 01, 10
11
x
x
Mask time for TXFAULT
detection by OPTALM
160 ms [Typ.]
160 ms [Typ.]
2 ms [Typ.]
2 ms [Typ.]
0 ms
Note
x
0
x
1
x
Accelerated start-up setting
Accelerated start-up setting
Non-support SFP
0
1
1
x
8.1.2
EXTALM1, EXTALM2
In SFP support mode setting (RE_SFP_SET
＝
”0”), a mask time can be set for TXFAULT detection by
EXTALM1 and EXTALM2 at the shutdown release.
In Table 8-2, a delay time relation to be set is shown.
Table 8-2 Time to Valid TXFAULT Detection by EXTALM1, EXTALM2
RE_TIMER_EXTALM1
RE_TIMER_EXTALM2
0
0
1
1
X
RE_SFP_SET
Mask time for TXFAULT detection
by EXTALM1, EXTALM 2
0 ms
2 ms [Typ.]
0 ms
Note
Non-support SFP
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