10LOG(I/Io) NORMALIZED TRANSMITTER CURRENT
(dB)
10LOG(I/Io) NORMALIZED TRANSMITTER CURRENT
(dB)
0
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
CABLE ATTENUATION
MAX (-40 ˚C, +85 ˚C)
MIN (-40 ˚C, +85 ˚C)
TYP (+25 ˚C)
0
1
2
3
dB/km
5.5
1.0
3.3
4
10
TYPICAL +25 ˚C
UNDERDRIVE
OVERDRIVE
WORST CASE
-40 ˚C, +85 ˚C
UNDERDRIVE
60
50
40
30
20
60
I
F
TRANSMITTER FORWARD CURRENT (mA)
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
CABLE ATTENUATION
MAX (-40 ˚C, +85 ˚C)
MIN (-40 ˚C, +85 ˚C)
TYP (+25 ˚C)
0
2
dB/km
4
1.5
2.8
4
TYPICAL +25 ˚C
UNDERDRIVE
OVERDRIVE
WORST CASE
-40 ˚C, +85 ˚C
UNDERDRIVE
-1
40
30
20
-2
WORST CASE
-40˚C, +85˚C
UNDERDRIVE
50
TYPICAL 26˚C
UNDERDRIVE
40
-3
30
-4
CABLE ATTENUATION
α
MAX (-40˚C, +85˚C)
α
MIN (-40˚C, +85˚C)
α
TYP (-40˚C, +85˚C)
0
0.4
0.8
1.2
1.6
dB/km
4
1
2.8
2
10
-5
20
-10
-11
6
-10
-11
6
-6
LINK LENGTH (km)
LINK LENGTH (km)
LINK LENGTH (km)
Figure 3. HFBR-1414/HFBR-2412 Link Design
Limits with 62.5/125 µm Cable.
Figure 4. HFBR-14x2/HFBR-24x2 Link Design
Limits with 100/140 µm Cable.
Figure 5. HFBR-14x4/HFBR-24x2 Link Design
Limits with 50/125 µm Cable.
75
70
t PLH OR t PHL PROPOGATION DELAY –ns
55
65
60
55
50
45
40
35
30
25
t
PLH
(TYP) @ 25˚C
tD – NRZ DISTORTION – ns
50
45
40
35
30
25
20
-22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12
P
R
– RECEIVER POWER – dBm
t
PHL
(TYP) @ 25˚C
20
-22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12
P
R
– RECEIVER POWER – dBm
Figure 6. Propagation Delay through System
with One Meter of Cable.
Figure 7. Typical Distortion of Pseudo Random
Data at 5 Mb/s.
PULSE
GEN
�½ 75451
+15 V
R
S
1N4150
2, 6, 7
3
10 W
I
F
10 W
RESISTOR VALUE AS NEEDED FOR
SETTING OPTICAL POWER OUTPUT
FROM RECEIVER END OF TEST CABLE
INPUT
I
F
50%
t
PHLT
t
PHLT
t
PHL
MIN
100 ns
PULSE REPETITION
FREQ = 1 MHz
100 ns
TRANSMITTER
+5 V
2
R
L
560
INPUT (I
F
)
TIMING
ANALYSIS
EQUIPMENT
eg. SCOPE
P
T
50%
t
PHL
MAX
V
O
5V
1.5 V
0
t
PHL
MIN
t
PHL
MAX
P
T
- FROM 1-METER
TEST CABLE
6
0.1 µF
7&3
HFBR-2412 RECEIVER
OUTPUT
+
V
O
15 pF
Figure 8. System Propagation Delay Test Circuit and Waveform Timing Definitions.
12
I
F
– TRANSMITTER FORWARD CURRENT – (mA)
60
50
I
F
TRANSMITTER FORWARD CURRENT (mA)
10 LOG (t/to) NORMALIZED TRANSMITTER CURRENT (dB)
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
