Laser driver and temperature compensation circuit thereof

Abstract

The invention discloses a laser driver and a temperature compensation circuit thereof. The temperature compensation circuit comprises a benchmark voltage generation unit, a benchmark current generation unit, a reference voltage generation unit, and a compensation current generation unit, wherein the benchmark voltage generation unit generates a benchmark voltage which increases with the increase of the temperature; the benchmark current generation unit is connected with the benchmark voltage generation unit and outputs benchmark current which increases with the increase of the benchmark voltage; the reference voltage generation unit generates a reference voltage which increases with the increase of the temperature; the compensation current generation unit is connected with the reference voltage generation unit, obtains the compensation threshold temperature according to the reference voltage, and outputs compensation current when the temperature is higher than or equal to the compensation threshold temperature; and the benchmark current and the compensation current are overlapped to form benchmark modulation current. The laser driver comprises the temperature compensation circuit and a bias current regulation circuit. An optical signal output by the laser can have constant extinction ratio by compensating modulation current of a laser through the temperature compensation circuit, and the laser can obtain steady output optical power by compensating bias current of the laser through the bias current regulation circuit.

Description

technical field [0001] The invention relates to optical communication technology, in particular to a laser driver and a temperature compensation circuit thereof. Background technique [0002] In the optical communication system, the semiconductor laser and the laser driver (LDD, Laser Diode Driver) are the key components of the optical transmitter, in which the laser driver amplifies the high-speed digital signal output by the serial converter or the multiplexer, and outputs the drive The driving current required by the laser, the driving current output by the laser driver (that is, the current of the laser) includes the modulation current and the DC bias current. [0003] The performance of lasers is characterized by parameters that vary with temperature, such as figure 1 The optical power-current curve of the laser diode (LD, Laser Diode) shown, the laser diode output optical power P L ~P H The laser can be generated within the range, as the temperature increases (T 1 ...

AI Technical Summary

Problems solved by technology

However, the use of cooling systems or refrigerators will occupy a large area and consume extra energy, which is difficult to meet the current trend of low power consumption and miniaturization of integrated circuits

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