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How to adjust the luminous power of an optical module

Optical access and telecom site reference Published 10 Jan 2025

Use this reference to prepare product questions for CGWEB NETWORKS. Check interfaces, capacity, protection and installation requirements against the current product documentation.

The luminous power of an optical module can be adjusted by controlling the laser diode's drive current, using power supply modulation, or managing the module's temperature via TEC controllers.

Understanding Optical Module Power

An optical module converts electrical signals into optical signals using a laser diode, such as a VCSEL, DFB, or EML, and transmits light through a fiber optic cable. The average transmit power represents the luminous intensity of the module and is influenced by the proportion of signal 1s in the data stream and the drive current applied to the laser. The extinction ratio, which measures the difference between the optical power for signal 1 and signal 0, also affects the effective luminous output and signal clarity (Huawei).

Methods to Adjust Luminous Power

Modulating the Laser Drive Current The simplest method is to adjust the current supplied to the laser diode. Increasing the current raises the optical output, while decreasing it reduces the luminous power. For directly modulated lasers (DMLs), the input electrical signal's 0/1 modulation directly controls the laser intensity (Monolithic Power Systems).

Using Buck-

Boost or Power Modules Optical modules often include buck-boost converters or integrated power modules to stabilize supply voltages for different components. By adjusting the output voltage of these converters, the current through the laser diode can be indirectly controlled, allowing fine-tuning of the optical power. Some modules use PWM signals from a microcontroller to regulate the output voltage of the power module, which in turn adjusts the laser current (Texas Instruments).

Thermal Management with TEC Controllers Laser diodes are sensitive to temperature. Thermoelectric coolers (TECs) maintain the laser at an optimal temperature, which affects its efficiency and output power. By controlling the TEC voltage or current, the module can slightly increase or decrease the luminous power while maintaining signal quality (Analog Devices).

Practical Considerations

Data Rate and Signal Integrity: Higher optical power can improve transmission distance but may increase signal distortion or frequency chirping in DFB and EML lasers. Power Budget: Adjustments must stay within the module's power budget to avoid overheating or damaging components. Monitoring: Many modules provide feedback on optical power via photodiodes, allowing closed-loop control for precise luminous power adjustment.

By combining drive current modulation, power supply control, and thermal management, the luminous power of an optical module can be effectively modified to meet system requirements while maintaining signal integrity and device reliability.

How to adjust the luminous power of an optical module - CGWEB NETWORK INFRASTRUCTURE [PDF]

How to adjust the luminous power of an optical module

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