HFBR-0528 Avago Technologies US Inc., HFBR-0528 Datasheet - Page 5

• Manufacturer Part Number: HFBR-0528
• Description: KIT EVAL FIBER OPTIC 10MBD
• Manufacturer: Avago Technologies US Inc.

Specifications of HFBR-0528

• Main Purpose: Interface, Fiber Optics
• Embedded: No
• Utilized Ic / Part: HFBR-1528, HFBR-2528
• Primary Attributes: 10MBd, Communication up to 50m using 1mm POF
• Secondary Attributes: Crimpless Connectors
• Silicon Core Number: HFBR-1528, HFBR-2528
• Kit Contents: TX/RX Mods, Cable, Pol Kit, SW, Pwr. Sup
• Silicon Family Name: Versatile Link
• Features: Fiber Optic Transmitter And Receiver
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 516-2144; HFBR-0528

Figure 6. Polymer vs. Hard Clad Silica Cables.
III. Fiber Optic Link Design
The HFBR-0508Z family is designed and characterized
for data rates from dc to 0 MBd; Avago Technologies
specifies link length for  mm POF fibers (0 to 60 m) and
200 µm HCS fibers (0 to 500 m). Power supply variations,
connector coupling loss and temperature drift effects
are part of the guaranteed data sheet specifications. In
addition, a 3 dB margin takes aging into account. Avago
Technologies specifies the link performance using the
transmitter and receiver interface circuits described in
the product data sheet, which gives Avago Technolo-
gies' customers the maximum available design security.
The following considerations will help the design engi-
neer to become more familiar with low-cost, fiber-optic
link design and gives guidelines to optimize the link per-
formance for particular applications.
1. Link Length Considerations
A fiber-optic system basically consists of an LED, a length
of fiber, and an optical detector. The LED transmitter,
modulated by the electrical input signal, couples light
into the fiber. The light travels along the fiber to an opti-
cal detector, which converts the light into an electrical
signal again. The important specifications for fiber-optic
links are how much light is coupled into the fiber, how
much light the receiver needs to function properly, and
how much light is lost in the fiber between the transmit-
ter and the receiver.
5
1 mm
PARAMETER
TENSION (60 min)
TENSION (10 YEAR)
BEND RADIUS (1H)
FLEX
ATTENUATION
(660 nm)
NA
INSTALLATION
TEMPERATURE
FLAMMABILITY
1 mm POF
980 mm
5510-7
200 dB/km
CORE
-20 C TO
1,000 X
25 mm
+70 C
1 mm
VW1
200 µ m HCS
POF
50N
0.47
1N
CLADDING
200
mm
5510-8
200/230
PLENUM
6 dB/km
50,000 X
-20 C TO
10 mm
+85 C
RISER
100N
LSZH
HCS
25N
0.37
230 mm
µ
m
100
18
16
14
12
10
0
500 520 540 560 580 600 620 640 660 680 700
8
6
4
530
570
Depending upon the fiber length and wavelength of
the signal source, if data rates are very high (25 MBd or
greater), the optical signal is distorted. This effect, called
dispersion
tem. Fortunately, in most industrial communication sys-
tems the data rate is less than 0 MBd and the dispersion
effect contributes only if the link length exceeds 00 m
with POF or 000 m with HCS Fibers. Below these values
the links are limited by attenuation, so a straightforward
optical power budget calculation is the only consider-
ation.
Figure 7. Attenuation vs. Wavelength for POF.
Figure 8. Typical Attenuation vs. Wavelength of HCS Fibers.
1.1 Optical Power Budgeting Computation
The optical power budget is the difference between the
output power of the transmitter and the sensitivity of
the receiver. The maximum length of the optical fiber is
determined by the attenuation of the fiber, additional
losses due to feed-through connections and a “safety
factor” called optical power margin (see chapter III/.4).
Formula III/ gives the maximum link length for worst-
case conditions: Versatile Link transmitter and receiver
specifications account for coupling losses to and from 
mm POF or 200 µm HCS fiber.
610
18
16
14
12
10
20
500
400
300
200
100
8
6
4
530
0
500 520 540 560 580 600 620 640 660 680 700
570
WAVELENGTH (nm)
WAVELENGTH (nm)
650
[3]
610
, limits the bandwidth of the fiber-optic sys-
WAVELENGTH (nm)
650
WAVELENGTH (nm)
690
690
730
730
770
810
770
850
810
850