Wavelength locking and parameter calibration method for V-cavity tunable modules.

Area of Science:

• Optical Engineering
• Telecommunications
• Laser Physics

Background:

• Traditional wavelength control in optical networks suffers from temperature sensitivity and mechanical complexity.
• Existing methods often require additional optical components or external detection devices, increasing system cost and size.

Purpose of the Study:

• To propose and validate an efficient wavelength locking scheme for V-cavity tunable laser optical modules operating at 25Gbps.
• To achieve stable laser wavelength control without external components by integrating a monitoring photodiode (MPD).

Main Methods:

• Implemented a temperature current control (TCC) algorithm utilizing an integrated MPD for real-time optical power monitoring.
• Employed curve fitting and the Newton method for rapid wavelength convergence to the communication channel's peak power.
• Optimized wavelength tuning by adjusting the TCC based on MPD feedback.

Main Results:

• The proposed scheme achieved efficient wavelength locking for 25Gbps V-cavity tunable laser modules.
• Experimental results showed an optimal TCC range of 47 mA to 53 mA across 15 measurements.
• Demonstrated high stability with a mean difference of 0.012 mA and a standard deviation of 0.0183 mA between ideal and actual operating points, indicating low wavelength drift.

Conclusions:

• The integrated MPD and TCC algorithm provide a stable and efficient wavelength locking solution for optical modules.
• The scheme simplifies system structures and enhances transmission performance, offering a viable alternative to complex traditional methods.
• This technology is suitable for high-density wavelength-division multiplexing (DWDM) systems and other advanced optical communication applications.