Symmetrical, direct coupled laser drivers

摘要

Symmetrical, direct coupled laser drivers for high frequency applications. The laser drivers are in integrated circuit form and use a minimum of relatively small (low valued) external components for driving a laser diode coupled to the laser driver through transmission lines. An optional amplifier may be used to fix the voltage at an internal node at data frequency spectrum to improve circuit performance. Feedback to a bias input may also be used to fix the voltage at the internal node. Programmability and a burst mode capability may be included.

主权项

1. A laser diode driver for coupling to a laser diode circuit, the laser diode circuit having a first laser diode circuit connection for coupling to a first power supply terminal, the first laser diode circuit connection being coupled to a first terminal of a first inductor, a second terminal of the first inductor being coupled to a first terminal of a laser diode and to a second laser diode circuit connection, a second terminal of the laser diode being coupled to a first terminal of a second inductor and to a third laser diode circuit connection, and a second terminal of the second inductor being coupled to a fourth laser diode circuit connection and through a first capacitor for coupling to a second power supply terminal;
the laser diode driver comprising: a first current source including circuitry for controllably coupling a first current to the second laser diode circuit connection or to the fourth laser diode circuit connection responsive to an enable or bias input signal; a second current source including circuitry for controllably coupling a second current to the second laser diode circuit connection or to the third laser diode circuit connection responsive to a data input signal.