Temperature compensation circuit for laser drive
A temperature compensation circuit, laser driver technology, applied in electrical components, power oscillators, etc., can solve the problems of difficult laser compensation proportional laser, difficult to adapt to laser temperature characteristics, fixed temperature compensation, etc., to achieve simple circuit structure, low price, The circuit is stable and reliable
A temperature compensation circuit, laser driver technology, applied in electrical components, power oscillators, etc., can solve the problems of difficult laser compensation proportional laser, difficult to adapt to laser temperature characteristics, fixed temperature compensation, etc., to achieve simple circuit structure, low price, The circuit is stable and reliable
CN102064765AInactive Publication Date: 2011-05-18FENGHUO COMM SCI & TECH CO LTD +1
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[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0024] Embodiments of the present invention are applied to laser drivers, see figure 2 As shown, it includes the temperature compensation circuit 1 applied to the laser driver, the modulation current output module 2 and the laser and its matching network 3, the temperature compensation circuit 1 applied to the laser driver outputs the compensation current I4 to the modulation current output module 2, and the modulation current output Module 2 will have a compensated modulating current I MOD Output to the laser, thereby compensating the temperature characteristics of the laser itself. The modulation current output module 2 is a more general differential output control method. The compensation current I4 directly controls the tail current source I0 of the differential output unit, which will directly affect the modulation current of the laser,...
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The invention discloses a temperature compensation circuit for a laser drive, comprising a positive temperature coefficient current generation module, a zero temperature coefficient current generation module and a temperature compensation proportion control module, wherein the output ends of the positive temperature coefficient current generation module and the zero temperature coefficient current generation module are respectively connected with the input end of the temperature compensation proportion control module; the positive temperature coefficient current generation module can be used for generating positive temperature coefficient current increasing with the temperature rise so as to determine a slope factor for temperature compensation; the zero temperature coefficient current generation module can be used for generating zero temperature coefficient current irrelevant with the temperature so as to determine the initial temperature of the temperature compensation; and the temperature compensation proportion control module can be used for sampling the difference between the positive temperature coefficient current and the zero temperature coefficient current and overlapping the difference with the external input current for controlling compensation current to determine the compensation current and further control the proportion of the temperature compensation, The temperature compensation circuit can be used for flexibly adjusting the compensation proportion of a laser and stabilizing the extinction ratio, adapts to the temperature characteristics of different lasers, and has strong generality.
Description
technical field [0001] The invention relates to a temperature compensation circuit, in particular to a temperature compensation circuit applied to a laser driver. Background technique [0002] In an optical communication system, a laser driver (LDD, Laser Diode Driver) and a laser are important components of a transmitter. The laser driver provides the required driving current for the laser. For the characteristics of the threshold current of the laser, the driving current includes the modulation current and the bias current. The modulation current is the high-speed digital signal transmitted, and the bias current is mainly used to turn on the threshold of the laser. Xi. The performance parameters of the laser will change with the temperature, figure 1 The optical power-current curve of the laser diode is shown. As the temperature increases, the threshold current of the laser diode will drift greatly, and the electro-optical conversion efficiency will decrease accordingly....
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Patent Timeline
18 May 2011
Publication
CN102064765A
- IPC
- H03B5/04
- Inventors
- 周华