Laser Source
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MIH® Laser Source 976nm laser source Up to 2.5W laser power out Adjustable power levels FC / ST connector available Compact design and easy to integrate Current Measurement (ECTs) Remote Sensors Power Electronics EMC Testing  RF over Fiber & 5G Photonic Power Module (PPM) The PPM includes one diode laser and a driver control board with one 7-pin connector. The PPM provides up to 2.5 W of optical power output, which is launched into a 3 meter multimode fiber (62.5/125 μm, NA 0.27) with FC connector at nominally 976nm wavelength. An extra heat sink for the module is required to provide sufficient cooling when operating under different environmental conditions. This unit is designed only for use when connected to a photovoltaic power converter (PPC), purchased separately. Assembly Drawing Figure 1. PPM Mechanical Drawing (unit: mm) MH GoPower Company Limited

Operation Principle External power must be applied to the module in accordance with Table 1 for proper operation of PPM. The PPM accepts a supply voltage in the range of 3.1 V to 6 V. A voltage applied on SDN pin enables the PPM when the voltage is higher than 1.4 V and disables the PPM when the voltage is lower than 0.95 V. The output optical power can be adjusted through LIS pin with a voltage ranging from 0V to 2.2 V. The drive current increases linearly with the voltage applied on LIS pin until the voltage reaches 2.2 V, and the drive current of the laser diode can be monitored by the...

Turning Laser On and Off The PPM can be turned on and off by setting the SDN pin high and lower respectively. It is recommended to turn the PPM on by following sequence: Turning on: turn on the PPM by providing the voltage supply on the VPS pin, turn on the PPM by raising the voltage of SDN pin. Turning off: turn off the PPM by lowering the voltage of SDN pin, turn off the PPM by stopping the voltage supply on the VPS pin. Adjusting the Laser Power The output laser power can be adjusted by setting the laser driving current through LIS pin. The driving current is set by adjusting the 10K...

Monitoring the Laser Power The PPM output power can be monitored by measuring the voltage on the LIO pin, which indicates the laser driving current level. This feature is very useful for micro-driver based system where the ADC is available and monitoring the current in real time is required. This pin provides a very low noise voltage signal which is proportional to the output current: VLIO (V) = 2.2 × Iout / 3.52 (V) For example, when the output signal equals to 1 V, the output current is 1.6 A. LIO pin can be used to drive an ADC directly, and also be measured by a multimeter during...

Fiber Contamination and Cleaning Fiber contamination is a key consideration for high-power laser modules. Dirt or contamination will cause a local temperature increase as it absorbs the dissipated cladding modes.   Wear gloves when handling fiber Avoid any contamination of fiber tip Fiber cleaning materials and procedures shown here are for informational purposes only and are not meant to recommend, endorse, or discredit any existing procedures. It is recommended that users evaluate any procedure or product before using it in applications where damage or failure could result. As always,...