Switching circuit for burst-mode tunable laser

A method for tuning a tunable laser, the method comprising:

• delivering, by a switching circuit, a bias current to an anode of a distributed Bragg reflector (DBR) section diode disposed on a shared substrate of the tunable laser;
• receiving, at the switching circuit, a burst mode signal indicative of a burst-on state or a burst-off state;
• when the burst mode signal is indicative of the burst-off state, offsetting, by the switching circuit, the bias current at the anode of the DBR section diode by one of:
• sourcing a push current with the bias current to the anode of the DBR section diode;
• or
• sinking a pull current away from the bias current at the anode of the DBR section diode;
• and
• when the burst mode signal is indicative of the burst-on state, ceasing, by the switching circuit, any offsetting of the bias current at the anode of the DBR section diode,
• wherein, when the burst mode signal is indicative of the burst-off state, the DBR section diode receives a diode current equal to a sum of the bias current and a difference between a source current that sources current to the anode of the DBR section diode and a sink current that sinks current away from the bias current at the anode of the DBR section diode.