20
HFBR-14X4 Output Power Measured out of 1 Meter of Cable
Parameter
Symbol
Min.
Typ.
[2]
50/125
μ
m
PT50
-18.8
-15.8
-19.8
-17.3
-13.8
-18.9
62.5/125
μ
m
PT62
-15.0
-12.0
-16.0
-13.5
-10.0
-15.1
100/140
μ
m
PT100
-9.5
-6.5
-10.5
-8.0
-4.5
-9.6
200
μ
m HCS
PT200
-5.2
-3.7
-6.2
-3.7
-1.7
-5.3
Max.
-13.8
-12.8
-11.4
-10.8
-10.0
-9.0
-7.6
-7.0
-4.5
-3.5
-2.1
-1.5
+0.8
+1.8
+3.2
+3.8
Unit
dBm
peak
Conditions
T
A
= 25
°
C
Reference
Notes 5, 6, 9
I
F
= 60 mA dc
T
A
= 25
°
C
I
F
= 100 mA dc
dBm
peak
T
A
= 25
°
C
I
F
= 60 mA dc
T
A
= 25
°
C
I
F
= 100 mA dc
dBm
peak
T
A
= 25
°
C
I
F
= 60 mA dc
T
A
= 25
°
C
I
F
= 100 mA dc
dBm
peak
T
A
= 25
°
C
I
F
= 60 mA dc
T
A
= 25
°
C
I
F
= 100 mA dc
Fiber Cable
NA = 0.2
Fiber Cable
NA = 0.275
Fiber Cable
NA = 0.3
Fiber Cable
NA = 0.37
14X2/14X4 Dynamic Characteristics
Parameter
Rise Time, Fall Time
(10% to 90%)
Rise Time, Fall Time
(10% to 90%)
Pulse Width Distortion
Symbol
t
r
, t
f
Min.
Typ.
[2]
4.0
Max.
6.5
Units
nsec
No Pre-bias
nsec
Conditions
I
F
= 60 mA
Figure 12
I
F
= 10 to
100 mA
Reference
Note 7,
t
r
, t
f
3.0
Note 7,
Figure 11
Figure 11
PWD
0.5
nsec
Notes:
1. For I
FPK
> 100 mA, the time duration should not exceed 2 ns.
2. Typical data at T
A
= 25
°
C.
3. Thermal resistance is measured with the transmitter coupled to a connector assembly and mounted on a printed circuit board.
4. D is measured at the plane of the fiber face and defines a diameter where the optical power density is within 10 dB of the
maximum.
5. P
T
is measured with a large area detector at the end of 1 meter of mode stripped cable, with an ST
precision ceramic ferrule (MIL-
STD-83522/13) for HFBR-1412/1414, and with an SMA 905 precision ceramic ferrule for HFBR-1402/1404.
6. When changing
μ
W to dBm, the optical power is referenced to 1 mW (1000
μ
W). Optical Power P (dBm) = 10 log P (
μ
W)/1000
μ
W.
7. Pre-bias is recommended if signal rate >10 MBd, see recommended drive circuit in Figure 11.
8. Pins 2, 6 and 7 are welded to the anode header connection to minimize the thermal resistance from junction to ambient. To further
reduce the thermal resistance, the anode trace should be made as large as is consistent with good RF circuit design.
9. Fiber NA is measured at the end of 2 meters of mode stripped fiber, using the far-field pattern. NA is defined as the sine of the half
angle,determined at 5% of the peak intensity point. When using other manufacturer’s fiber cable, results will vary due to differing
NA values and specification methods.
All HFBR-14XX LED transmitters are classified as IEC 825-1 Accessible Emission Limit (AEL)
Class 1 based upon the current proposed draft scheduled to go in to effect on January 1, 1997.
AEL Class 1 LED devices are considered eye safe. Contact your Agilent sales representative for
more information.
CAUTION: The small junction sizes inherent to the design of these components increase the components’
susceptibility to damage from electrostatic discharge (ESD). It is advised that normal static precautions be
taken in handling and assembly of these components to prevent damage and/or degradation which may be
induced by ESD.