Current/frequency-modulation characteristics for directly optical frequency-modulated injection lasers at 830 nm and 1.3 ¿m

The modulus and phase of the current/frequency-modulation transfer function for a 1.3 ¿m GaInAsP/InP BH laser have been measured in the frequency range from 1 kHz to 500 MHz. Using a Hilbert transformation it is demonstrated how the phase delay can be determined from the modulus for two different lasers, the 1.3 ¿m BH laser and an 830 nm CSP laser.