High-speed laser device driving circuit

Abstract

The invention provides a high-speed laser device driving circuit which involves an input buffer stage, a signal amplification stage, an output driving stage, a laser device current source and a directly modulated laser device. The output driving stage comprises an output amplifier and a transistor, the output end of the input buffer stage is connected with the input end of the signal amplification stage, the output end of the signal amplification stage is connected with the input end of the output amplifier, the output end of the output amplifier is connected with the transistor, the transistor is a BJT transistor or an MOSFET transistor, only one laser device current source is arranged, and the laser device current source is connected between a power supply and the anode of the directly modulated laser device or connected between the cathode of the directly modulated laser device and the ground. The high-speed laser device driving circuit can be used for directly driving high-speed distributed feedback laser devices and others, and the design difficulty of an existing high-speed directly modulated laser device driving circuit is reduced.

Description

technical field [0001] The invention belongs to the field of optical communication systems and relates to a high-speed laser drive circuit. Background technique [0002] The optical module is the basic hardware to realize the optical communication system, and the high-speed laser driver circuit is the basic component for the high-speed optical module to realize the light emission function. Compared with the electro-absorption modulation method, the direct modulation method can greatly reduce the cost of the optical transmitter, thereby significantly reducing the cost of the optical module and the system. At present, the direct modulation drive circuit for directly modulated lasers (for example, distributed feedback laser, Distributed Feedback Laser, DFB) generally divides the current of the laser into two parts, the bias current and the modulation current, and generates them separately for the laser. Among them, the bias current is used to provide the current required when ...

AI Technical Summary

Problems solved by technology

However, at high rates (such as 10Gbps and above), due to the high-speed and high-current driving capability requirements of the laser drive circuit and the high-frequency impedance matching between it and the directly modulated laser, it is difficult to design, resulting in no large-scale High-speed direct modulation laser drive circuit for large-scale commercial applications

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