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

In modern optical communication networks, traditional wavelength control technologies face limitations such as temperature sensitivity and complex mechanical structures. A wavelength locking scheme for V-cavity tunable laser optical modules with a transmission rate of 25Gbps is proposed in this paper. By integrating a monitoring photodiode (MPD) within the optical module and implementing a temperature current control algorithm, efficient wavelength locking is achieved without the need for additional optical components or external detection devices. The scheme utilizes the MPD to monitor the transmitted and received optical power in real-time and optimizes wavelength tuning by adjusting the temperature-control current (TCC). Through curve fitting and the Newton method, rapid wavelength convergence is ensured to match the peak power of the communication channel. Experimental results demonstrate that the optimal TCC range for 15 sets of measurements is between 47 mA and 53 mA, with a mean difference of 0.012 mA and a standard deviation of 0.0183 mA between the ideal and actual operating points, verifying the stability and low wavelength drift characteristics of the proposed scheme. This scheme has the potential to simplify system structures and enhance transmission performance, making it applicable to high-density wavelength-division multiplexing systems and other optical communication scenarios.