AK2572 Datasheet, PDF (19/50 Pages) Asahi Kasei Microsystems – APC for Burst Mode Applicable Direct Modulation Laser Diode

ASAHI KASEI
[AK2572]
Fig.4-7 Setting Example 3 (BIAS＝FF,MOD＝FF)
R_APC_FB
0
R_MOD_FF
R_MOD_FB
=0
R_MOD
RE_DAC1_GAIN
(RE_DAC3_GAIN)
I-DAC1(V-DAC3)
10/255
(2.2/255)
G_DAC1
(G_DAC3)
Imod
(Vmod)
R_BIAS_FB
=0
I-DAC2
R_BIAS
0
85/255
G_DAC2
Ibias
Fig.4-8 Setting Example 4 (BIAS＝FF,MOD＝FF+FB)
R_MOD_FF
RE_DAC1_GAIN
(RE_DAC3_GAIN)
R_MOD_FB
I-DAC1(V-DAC3)
Imod
R_APC_FB
1
=R_APC_FB
R_MOD
10/255
(2.2/255)
G_DAC1
(G_DAC3)
(Vmod)
R_BIAS_FB
=0
I-DAC2
R_BIAS
0
85/255
G_DAC2
Ibias
R_MOD=R_MOD_FF
R_BIAS=R_BIAS_FF
R_BIAS_FF
RE_DAC2_GAIN
G_DAC1= 1 or 0.1
G_DAC2= 1 or 0.5
G_DAC3= 1 or 1.2/2.2
R_BIAS_FF
R_MOD=R_MOD_FF+R_MOD_FB
=R_MOD_FF+R_APC_FB
R_BIAS=R_BIAS_FF
RE_DAC2_GAIN
G_DAC1= 1 or 0.1
G_DAC2= 1 or 0.5
G_DAC3= 1 or 1.2/2.2
Fig.4-9 Setting Example 5 (BIAS＝FF+FB,MOD＝FF) Fig.4-10 Setting Example 6 (BIAS＝FB,MOD＝FB)
R_APC_FB
0
R_MOD_FF
R_MOD_FB
=0
R_MOD
RE_DAC1_GAIN
(RE_DAC3_GAIN)
I-DAC1(V-DAC3)
10/255
(2.2/255)
G_DAC1
(G_DAC3)
Imod
(Vmod)
RE_MOD_FBRT
R_MOD_FF=0
R_APC_FB
K_MOD
_FBRT
R_MOD_FB
R_MOD
RE_DAC1_GAIN
(RE_DAC3_GAIN)
I-DAC1(V-DAC3)
10/255
(2.2/255)
G_DAC1
(G_DAC3)
Imod
(Vmod)
R_BIAS_FB
=R_APC_FB
I-DAC2
R_BIAS
1
85/255
G_DAC2
Ibias
K_BIAS
_FBRT
R_BIAS_FB
R_BIAS
I-DAC2
85/255
G_DAC2
Ibias
R_MOD=R_MOD_FF
R_BIAS_FF
R_BIAS=R_BIAS_FF+R_BIAS_FB
=R_BIAS_FF+R_APC_FB
RE_DAC2_GAIN
G_DAC1= 1 or 0.1
G_DAC2= 1 or 0.5
G_DAC3= 1 or 1.2/2.2
RE_BIAS_FBRT
R_BIAS_FF=0
R_MOD=R_MOD_FB
（R_MOD_FB=K_MOD_FBRT*R_APC_FB）
R_BIAS=R_BIAS_FB
（R_BIAS_FB=K_BIAS_FBRT*R_APC_FB）
RE_DAC2_GAIN
G_DAC1= 1 or 0.1
G_DAC2= 1 or 0.5
G_DAC3= 1 or 1.2/2.2
Fig.4-11 Setting Example 7 (BIAS＝FB,MOD＝FF+FB) Fig. 4-12 Setting Example 8 (BIAS＝FF+FB,MOD＝FB)
RE_MOD_FBRT
R_MOD_FF
R_APC_FB
K_MOD
_FBRT
R_MOD_FB
R_MOD
RE_DAC1_GAIN
(RE_DAC3_GAIN)
I-DAC1(V-DAC3)
10/255
(2.2/255)
G_DAC1
(G_DAC3)
Imod
(Vmod)
K_BIAS
_FBRT
R_BIAS_FB
R_BIAS
I-DAC2
85/255
G_DAC2
Ibias
RE_MOD_FBRT
R_MOD_FF=0
R_APC_FB
K_MOD
_FBRT
R_MOD_FB
R_MOD
RE_DAC1_GAIN
(RE_DAC3_GAIN)
I-DAC1(V-DAC3)
10/255
(2.2/255)
G_DAC1
(G_DAC3)
Imod
(Vmod)
K_BIAS
_FBRT
R_BIAS_FB
I-DAC2
R_BIAS
85/255
G_DAC2
Ibias
RE_BIAS_FBRT
R_BIAS_FF=0
R_MOD=R_MOD_FF+R_MOD_FB
（R_MOD_FB=K_MOD_FBRT*R_APC_FB）
R_BIAS=R_BIAS_FB
（R_BIAS_FB=K_BIAS_FBRT*R_APC_FB）
RE_DAC2_GAIN
G_DAC1= 1 or 0.1
G_DAC2= 1 or 0.5
G_DAC3= 1 or 1.2/2.2
RE_BIAS_FBRT
R_BIAS_FF
R_MOD=R_MOD_FB
（R_MOD_FB=K_MOD_FBRT*R_APC_FB）
R_BIAS=R_BIAS_FF+R_BIAS_FB
（R_BIAS_FB=K_BIAS_FBRT*R_APC_FB）
RE_DAC2_GAIN
G_DAC1= 1 or 0.1
G_DAC2= 1 or 0.5
G_DAC3= 1 or 1.2/2.2
Fig.4-13 Setting Example 9 (BIAS＝FF+FB, MOD＝FF+FB)
RE_MOD_FBRT
R_MOD_FF
R_APC_FB
K_MOD
_FBRT
R_MOD_FB
R_MOD
RE_DAC1_GAIN
(RE_DAC3_GAIN)
I-DAC1(V-DAC3)
10/255
(2.2/255)
G_DAC1
(G_DAC3)
Imod
(Vmod)
K_BIAS
_FBRT
R_BIAS_FB
R_BIAS
I-DAC2
85/255
G_DAC2
Ibias
RE_BIAS_FBRT
R_BIAS_FF
R_MOD=R_MOD_FF+R_MOD_FB
（R_MOD_FB=K_MOD_FBRT*R_APC_FB）
R_BIAS=R_BIAS_FF+R_BIAS_FB
（R_BIAS_FB=K_BIAS_FBRT*R_APC_FB）
<MS0290-E-01>
RE_DAC2_GAIN
G_DAC1= 1 or 0.1
G_DAC2= 1 or 0.5
G_DAC3= 1 or 1.2/2.2
-19-
2004/8