Common Cathode Laser Driving Circuit
First Claim
1. A method comprising:
- delivering, by a laser driving circuit, a bias current to an anode of a gain-section diode disposed on a shared substrate of a tunable laser;
receiving, at the laser driving 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, sinking, by the laser driving circuit, a sink current away from the bias current at the anode of the gain-section diode, the sink current less than the bias current delivered to the anode of the gain-section diode; and
when the burst mode signal is indicative of the burst-on state, modulating, by the laser driving circuit, the tunable laser by a capacitively coupled modulation stage of the laser driving circuit to the anode of the gain-section diode, resulting in an alternating current (AC) modulation current.
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Abstract
A method for biasing a tunable laser during burst-on and burst-off states through a common-cathode laser driving circuit includes delivering a bias current to an anode of a gain-section diode having a shared substrate with the laser, and receiving 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, the method includes sinking a sink current away from the anode of the gain-section diode. The sink current is less than the bias current delivered to the anode of the gain-section diode. When the burst mode signal transitions to be indicative of the burst-on state from the burst-off state, the method includes ceasing the sinking of the sink current away from the anode of the gain-section diode, and delivering an overshoot current to the anode of the gain-section diode to accelerate heating of the gain-section diode.
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Citations
30 Claims
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1. A method comprising:
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delivering, by a laser driving circuit, a bias current to an anode of a gain-section diode disposed on a shared substrate of a tunable laser; receiving, at the laser driving 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, sinking, by the laser driving circuit, a sink current away from the bias current at the anode of the gain-section diode, the sink current less than the bias current delivered to the anode of the gain-section diode; and when the burst mode signal is indicative of the burst-on state, modulating, by the laser driving circuit, the tunable laser by a capacitively coupled modulation stage of the laser driving circuit to the anode of the gain-section diode, resulting in an alternating current (AC) modulation current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A common-cathode laser driving circuit comprising:
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a voltage source configured to deliver a bias current to an anode of a gain-section diode disposed on a shared substrate of a tunable laser; a sinking stage configured to receive a burst mode signal indicative of a burst-on state or a burst-off state, the sinking stage configured to; when the burst mode signal is indicative of the burst-off state, sink a sink current away from the bias current at the anode of the gain-section diode, the sink current less than the bias current received by the anode of the gain-section diode; and when the burst mode signal is indicative of the burst-on state, cease the sinking of the sink current away from the bias current at the anode of the gain-section diode; and a modulation stage capacitively coupled to the anode of the gain-section diode, the modulation stage configured to output an alternating current (AC) modulation current when the burst mode signal is indicative of the burst-on state. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification