DX1 Laser Diode Controller Module

Transcription

1 IMPORTANT: Please ensure that the correct rail voltage of +5 V is connected to the DX1 for safe operation of this device. Absolute maximum ratings for the DX1 are given in the Specifications section. Laser Safety This is a class 3B laser product as defined by International Standard IEC6825-1, Edition 2. Invisible laser radiation is emitted from the end of the fibre or connector. Avoid direct eye exposure to the beam. NOTE: Warranty will be voided if DX1 module is opened. North American Distributor 1195 Pennsylvania Ave. Bethlehem, PA 1818 USA Phone: Sales: contact@cybel-llc.com Website:

2 OVERVIEW The DX1 laser diode (LD) and TEC controller from Eblana Photonics is an extremely precise, stable and convenient way to supply bias current and manage the temperature behaviour of the Eblana Photonics Discrete Mode (DM) and Narrow Linewidth (NLW) laser diodes. The module is capable of both CW and modulated operation with low noise, allowing the laser diode to achieve excellent stability and reliability. Both the bias and the laser temperature can be tuned accurately using an externally applied voltage. Alternatively, the DX1 can be shipped with a custom steady-state specification to deliver a precisely set bias current at a fixed temperature, depending on customer requirements. This manual provides all the information necessary for the safe operation of the DX1 module, along with a complete list of technical specifications and available accessories. BEFORE CONNECTING The DX1 features a 4-pin connector (plug included) for providing power and setting the bias and TEC voltages. The pin connections are detailed in the figure below. Figure 1: Diagram of 4-pin plug female connection face on. Pin No. Name Description 1 V TEC Controls the set TEC temperature (.1 3. V) 2 Ground Common ground ( V) 3 V CC Provides main rail voltage for the DX1 (5 V) 4 V bias Sets the bias current value ( 1.2 V for DM lasers / 2.5 V for NLW lasers) Table 1: Pin Assignments

3 CONNECTING THE DX1 The DX1 module requires a voltage (V CC ) of +5 V. This is connected to PIN 3 via the supplied 4-pin plug, through the red wire (Please see Fig. 2). The corresponding ground connection is made through PIN 2 via the black ground wire. CONTROLLING THE TEC If no voltage is supplied to the TEC connector, a default temperature value of 25 C is set (unless an alternative temperature is requested). The corresponding TEC voltage for 25 C operation is 1.5 V. In order to override this value and tune the temperature of the laser diode, an external voltage must be connected to PIN 1 via the green wire on the supplied 4-pin plug. The range of operation for the TEC voltage supply is.1 V (15 C) to 3 V (35 C). SETTING THE BIAS CURRENT If the bias pin is not connected, the bias current is set to 8 ma by default for DM lasers and 2 ma for NLW lasers (or set to an alternative value according to customer requirements). In order to set a specific bias current, or to modulate the bias current, an external voltage must be connected to PIN 4 via the blue wire on the supplied 4-pin plug. Connecting an external voltage will override the default value. The range of bias current values that can be supplied is directly proportional to the voltage supplied such that a range of 2.5 V corresponds to 25 ma. The maximum bias current for the Eblana Photonics DM laser diodes is 12 ma, thus the bias voltage should not exceed 1.2 V. The maximum bias current for NLW laser diodes is 25 ma, thus the bias voltage should not exceed 2.5 V. The bias current modulation bandwidth for DM lasers is 8 khz. The bias transfer function is calculated simply as follows: LD bias current (ma) = applied bias voltage (V) x 1. Optional 3 V DC Voltage source to set laser temp from 15 C 35 C Note: If user wishes to operate DX1 at default temperature, green wire should be left floating. +5 V DC Voltage source DX1 Optional 2.5 V DC Voltage source to set laser current from 25 ma Note: If user wishes to operate DX1 at default operating current, blue wire should be left floating. Figure 2: Example of DX1 connection configurations. Dashed box not required for factory set-steady state operation

4 Figure 3: Schematic diagram of DX1 module (all measurements in mm) Parameter Min Typ Max Unit Supply voltage V Laser Bias current (DM) 8 12 ma Bias voltage Laser Bias current (NLW) Bias Voltage V ma V TEC voltage V Setting accuracy - ±.2 - ma Resolution ma Noise (1 Hz 1 MHz) - < 2 - μa Ripple (5 Hz, rms) - < 2 - μa Short term fluctuations (15 s) - < 2 - μa Temperature coefficient ppm/ C Drift (3 min, 1 Hz) - < 5 - μa Modulation bandwidth (DM) DC - 8 khz Submount operating temperature C Storage temperature C Thermistor resistance kω Table 2: Electrical and Temperature parameters

5 ADDITIONAL INFORMATION 25 Bias current supplied (ma) Voltage applied to PIN 4 (V) Figure 4: Plot of applied laser current response as a function of voltage applied to PIN 4 35 Laser temperature ( C) Voltage applied to PIN 1 (V) Figure 5: Plot of laser temperature response as a function of voltage applied to PIN 1

6 Other products by Eblana Photonics Please visit for more information or us at 1195 Pennsylvania Ave. Bethlehem, PA 1818 USA Phone: