Features
- Low-noise programmable current source up to 1A
- Integrated TEC controller/driver
- SPI Interface (includes USB to SPI cable)
- Software GUI provides computer control
- Non-volatile storage of bias and temperature setpoints
- Analog inputs for fine laser temperature and bias control
Notes
1. From digitally programmed temperature setpoint
2. Corresponds to 0-20uA monitor photodiode photocurrent
Overview
The FP4525 Whisper Drive is a stand-alone solution for driving our DFB laser products. The driver consists of a programmable laser bias current source (1A maximum) as well as a thermoelectric cooler (TEC) controller/driver with programmable temperature setpoint. The FP4525 is computer controlled using the supplied USB to SPI adapter cable and software interface. Bias and temperature setpoints can be stored in non-volatile memory for use without requiring computer control. The current source and TEC driver are all-linear, low-noise implementations to prevent degradation of laser performance. Analog inputs are provided for fine adjustment of laser setpoints and for customer-implemented closed loop control. An internal transimpedance amplifier converts the monitor photodiode photocurrent into an analog voltage available on the interface connector. A power supply is provided.
Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Laser Bias Current | FSI | 0-1 | A |
| Laser Bias Current Setpoint Resolution | 1 | mA | |
| Laser Temperature Setpoint | T laser | 10-40 | °C |
| Laser Temperature Setpoint Resolution | 0.03 | °C |
|
| TEC Voltage (maximum) | ±2 | V | |
| TEC Current (maximum) | ±4 | A | |
| Power Adjust Analog Input Voltage | VPA | 0-2 | V |
| Power Adjust Current Adjustment | 0-1 | A | |
| Temperature Adjust Analog Input Voltage | VTA | 0-2 | V |
| Temperature Adjust Magnitude1 | ±4 | °C | |
| Monitor PD Output Voltage2 | VMON | 0-3 | V |
| Input Supply Voltage | 5 | V | |
| Input Supply Current (maximum) | 5.5 | A |