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High Speed Laser Diode Driver
The HY6410 Laser Diode Driver is a high speed,
high current solid-state hybrid laser diode driver. It incorporates a patented technique of “backmatching” which allows
remote drive of the laser diode through a 50Ω coaxial transmission line. This technique allows physical and thermal
isolation of the laser diode and the driver . The laser diode
can be driven through a transmission line without the need
for a matched impedance termination. This removes a large
source of heat that can be detrimental to high performance
laser diode systems.
The HY6410 is used in applications that require digital, high speed, current modulation of the laser diode. The
HY6410 input is ECL-compatible and is terminated into
50Ω. The HY6410 uses a GaAsFET current switch that
drives a laser diode with modulation currents of up to
400mA peak-to-peak. Two programmable current sources
allow user selectability of the bias and modulation currents.
The pre-bias current is selectable from zero to 40mA.The
Modulation current is selectable from zero to 400mA. These
selected currents modulate the laser beam at the input frequency . The HY6410 comes in a hermetic metal package.
HY6410
Laser Diode Driver
TEC Controllers Laser Diode Drivers Micro-heaters
Features:
✦ Single ended ECL input (50Ω)
✦ Data rates up to 622Mbps
✦ Programmable bias current
✦ Adjustable modulation current
✦ Patented “backmatching” thermal
management
✦ Backmatched output allows remote drive
through 50Ω line
Figure 1 Figure 2
400 Hot Springs Road, Carson City NV 89706 • (775) 883-0820 • Fax (775) 883-0827 • www.hytek.com • 23
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HY6410
Laser Diode Driver
Input Specifications
Power Inputs
–5.2V Supply –4.9V to –5.5V @ 1 15mA max.
–12V Supply (–V) –9V to –12V @ 420mA max.
RF IN ECL logic levels, 0–622Mbps
BIAS I 0 to 40mA for input voltage –V to –V + 2V
MOD I 0 to 400mA for input voltage –V to –V + 1.0V
Output Specifications
RF OUT Current output into 50Ω transmission line
Low Current = BIAS I, High Current = MOD I
RF OUT Transmission Line Length 10 feet max.
REF OUT –V +5V
Environmental Conditions
Operating T emperature –55°C to 100°C (case)
Storage T emperature –65°C to 150°C
Pin Designations
Description HY6410
–5.2V input (–5.2V) Pin 1
Ground (GND) Pin 2
–V Input (–V) Pin 3
Reference Voltage Output (REF OUT) Pin 4
Bias I Adjust (BIAS I) Pin 5
Modulation I Adjust (MOD I) Pin 6
ECL Input Waveform (RF IN) SMA 1
Laser Diode Current Drive (RF OUT) SMA 2
Ordering Information
Model No. HY6410
Description: 400mA High Speed Laser Diode Driver;
metal hermetic package
Application: ECL Digital Modulation of Laser Diode
Pin Descriptions
> –5.2V INPUT: Power supply input for ECL buffer circuitry .
> GROUND: Ground return for –5.2V ECL supply and –V .
> –V: Power Supply input for Bias and Modulation currents as well as laser diode drive circuitry .
> REF OUT : Precision reference output, +5V with respect to –V (if –V is –12V, REF OUT would be –7V).
> BIAS I: Input used to set the Bias current for the laser diode. Maximum bias current occurs when the voltage at
the BIAS I input is +2V with respect to the –V input. The voltage at the BIAS I input for a given bias current is determined by the equation: V(BIAS I) = –V + (desired bias current) x 40
> MOD I: Input used to set the Modulation current for the laser diode. This current is added to the Bias I current
which always flows through the laser diode. Maximum modulation current occurs when the voltage at the
MOD I input is +0.5V with respect to the –V input. The current set by the MOD I voltage is controlled by
the ECL RF input. When the RF input is open or set to an ECL “low” input, only BIAS I current flows
through the laser diode. The voltage at the MOD I input for a given modulation current is determined by
the equation: V(MOD I) = –V + (desired modulation current) x 2.5
> RF IN: SMA connector for single ended ECL input. The input is terminated with an equivalent 50Ω into –2V re-
quired by the ECL logic family . This input accepts data rates up to 622Mbps.
> RF OUT : SMA connector for 50Ω transmission line connected to laser. The patented “backmatching” technique
does not require a 50Ω termination at the laser diode end of the transmission line.
ΩΩ
Ω
ΩΩ
ΩΩ
Ω
ΩΩ
24 • 400 Hot Springs Road, Carson City NV 89706 • (775) 883-0820 • Fax (775) 883-0827 • www.hytek.com
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