19

Hard Clad Silica Fiber (200

the HFBR-15X7 transmitter in the recommended application circuit (Figure 1) for HCS; 1-125 MBd, 25

°C.

Parameter

Symbol

Typical

Unit

Condition

Note

Average Optical Power 200

µm HCS

-14.6

dBm

50% Duty

Note 1, Fig 3

Cycle

Average Modulated Power 200

µm HCS

-16.2

dBm

Note 2, Fig 3

Optical Rise Time (10% to 90%)

3.1

ns

5 MHz

Optical Fall Time (90% to 10%)

3.4

ns

5 MHz

High Level LED Current (On)

60

mA

Note 3

Low Level LED Current (Off)

6

mA

Note 3

Optical Overshoot - 200

µm HCS

30

%

Transmitter Application Circuit

130

mA

Figure 1

Current Consumption - 200

µm HCS

Notes:

1. Average optical power is measured with an average power meter at 50% duty cycle, after 1 meter of fiber.

2. To allow the LED to switch at high speeds, the recommended drive circuit modulates LED light output between two non-zero power

levels. The modulated (useful) power is the difference between the high and low level of light output power (transmitted) or input

power (received), which can be measured with an average power meter as a function of duty cycle (see Figure 3). Average Modulated

Power is defined as one half the slope of the average power versus duty cycle:

Average Modulated Power = ––——————————————————————

(2) [0.80 - 0.20]

3. High and low level LED currents refer to the current through the HFBR-15X7 LED. The low level LED “off” current, sometimes

referred to as “hold-on” current, is prebias supplied to the LED during the off state to facilitate fast switching speeds.

Plastic Optical Fiber (1 mm POF) Transmitter Application Circuit:

Performance of the HFBR-15X7 transmitter in the recommended application circuit (Figure 1) for POF; 1-

125 MBd, 25

°C.

Parameter

Symbol

Typical

Unit

Condition

Note

Average Optical Power 1 mm POF

-9.7

dBm

50% Duty

Note 1, Fig 3

Cycle

Average Modulated Power 1 mm POF

-11.3

dBm

Note 2, Fig 3

Optical Rise Time (10% to 90%)

2.1

ns

5 MHz

Optical Fall Time (90% to 10%)

2.8

ns

5 MHz

High Level LED Current (On)

19

mA

Note 3

Low Level LED Current (Off)

3

mA

Note 3

Optical Overshoot - 1 mm POF

45

%

Transmitter Application Circuit

110

mA

Figure 1

Current Consumption - 1 mm POF