rule of thumb for L

As the impedance ${X_L=2\pi f L}$ of the inductivity should be much higher than the dynamic resistance ${X_Q}$ of the laser to block the AC component from the DC supply, applying ${X_L>100X_Q}$ leads to roughly ${L > 16 X_Q / f}$.

In general, ${X_Q}$ is of the order of 1..2 $\Omega$. For a modulation frequency of 10kHz, ${L}$ should therefore be of the order of 3mH or larger.