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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)： | 26/50頁 |
| 文件大?。?/td> | 463K |
| 代理商： | AK2572 |
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ASAHI KASEI
[AK2572]
-26-
< MS0290-E-01>
2004/8
Table 5-1 EEPROM Address Space in Power Leveling [1]
RE_MODV_SEL
MOD_CTRL-pin
EEPROM
Device Address
E_MOD_TC [2]
A0h
E_MOD_TC [1]
A4h
E_BIAS_TC
A4h
E_EXTRA_TC
A6h
[*] Since Write Protect control register is allocated at “Device Address
＝
A0h / Address
＝
7Eh, 7Fh”, E_MOD_TC
[2] has 126 address locations. Therefore E_MOD_TC [2] has 2 fewer address locations as compared with
E_MOD_TC [1] and E_BIAS_TC. So the linear interpolation of E_MOD_TC [2] is executed as follows :
1
0
H
L
H
L
Address
00h ~ 7Dh [*]
00h ~ 7Fh
80h ~ FFh
00h ~ 1Fh
DAC
V-DAC3
－
I-DAC2
I-DAC1
－
I-DAC1
－
I-DAC2
V-DAC3
－
V-DAC3
I-DAC2
I-DAC1
I-DAC1
I-DAC2
V-DAC3
R_MOD_FF(z)
＝
E_MOD_TC2(x
－
1)
＋｛
E_MOD_TC2(x)
－
E_MOD_TC2(x
－
1)
｝×
R_TEMP [0] / 2
when z
＝
R_TEMP [7:0]
＝
0 ~ 5, E_MOD_TC(x)
＝
E_MOD_TC(x
－
1)
＝
E_MOD_TC(0)
where the detected temperature data is R_TEMP [7:0]
＝
z
＝
2x+5,2x+4, R_TEMP [7:1]
＝
x, E_MOD_TC[2] as
E_MOD_TC2(x) and the obtained data by a linear interpolation is R_MOD_FF(z).
5. 2
Power Leveling [2]
In Power Leveling [2] mode, the data to be loaded to register (R_BIAS_FF, R_MOD_FF) can be selected by
R_PWR_SEL setting among 4 patterns of Bias current and Modulation current temperature compensation
data that are retained in EEPROM.
Power Leveling [2] is enabled by setting RE_PWR_LVL1_SET
＝
“0” and RE_PWR_LVL2_SET
＝
“1”.
When the write protect is released (WP-pin
＝
“H” and R_WP_CTRL
＝
“0”), R_PWR_SEL [1:0] data at “Device
Address
＝
A8h / Address
＝
2Fh” can be altered in Self-Operation Mode.
When Power Leveling [2] is enabled, a linear interpolation of the temperature compensation data is executed by
using R_TEMP [7:3], R_TEMP [2:0] and the data in EEPROM as shown in Table 5-2.
R_BIAS_FF(z)
＝
E_BIAS_TCn(y
－
1)
＋｛
E_BIAS_TC n(y)
－
E_BIAS_TCn(y
－
1)
｝×
R_TEMP [2:0] / 8
R_MOD_FF(z)
＝
E_MOD_TCn(y
－
1)
＋
{E_MOD_TCn(y)
－
E_MOD_TCn(y
－
1)}
×
R_TEMP [2:0] / 8
when y
＝
0 (R_TEMP [7:0]
＝
z
＝
0~7), E_BIAS_TCn(y)
＝
E_BIAS_TCn(y
－
1)
＝
E_BIAS_TCn(0) and
E_MOD_TCn(y)
＝
E_MOD_TCn(y
－
1)
＝
E_MOD_TCn(0).
where the detected temperature data R_TEMP [7:0]
＝
z
＝
8y, 8y+1,
, 8y+7, R_TEMP [7:3]
＝
y, the
temperature compensation data retained in EEPROM is E_BIAS_TCn(y), E_MOD_TCn(y), n
＝
0~3 and the
obtained data by a linear interpolation is R_BIAS_FF(z), R_MOD_FF(z) respectively.
Table 5-2 EEPROM Address Space in Power Leveling [2]
RE_ PWR_LVL2_SET
＝
”0”
R_TEMP
［
7:1
］
Data
RE_PWR_SEL R_TEMP
［
7:3
］
0
1
2
3
0
1
2
3
RE_ PWR_LVL2_SET
＝
”1”
Address
Data
Address
00h ~ 1Fh
00h ~ 1Fh
00h ~ 1Fh
00h ~ 1Fh
00h ~ 1Fh
00h ~ 1Fh
00h ~ 1Fh
00h ~ 1Fh
E_MOD0_TC 00h ~ 1Fh
E_MOD1_TC 20h ~ 3Fh
E_MOD2_TC 40h ~ 5Fh
E_MOD3_TC 60h ~ 7Fh
E_BIAS0_TC 80h ~ 9Fh
E_BIAS1_TC A0h ~ BFh
E_BIAS2_TC C0h ~ DFh
E_BIAS3_TC E0h ~ FFh
00h ~ 7Fh
E_MOD_TC 00h ~ 7Fh
00h ~ 7Fh
E_BIAS_TC 80h ~ FFh
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