| 摘要 |
Direct-coupled laser diode drivers are provided which eliminate the need for conventional coupling elements (e.g., capacitors and inductors) that typically introduce timing inacurracies and add complexity, size and cost to conventional drivers. The drivers are structured to reduce power dissipation and maintain sufficient transistor headroom to enhance response time and dynamic range. An exemplary driver responds to data pulses that are defined by first and second pulse levels and includes a current source that generates an imod/n current, a current mirror connected to receive the imod/n current and, in response, drive a modulation current imod through the laser diode and a differential pair of transistors that steers the imod/n current away from the modulation current mirror in response to the first pulse levels so that the modulation current mirror drives imod current pulses through the laser diode during the second pulse levels with no need for coupling elements. The drivers are stabilized with feedback light from the laser diode.
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