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Drive circuit of semiconductor optical amplifier

A technology for driving circuits and optical amplifiers, applied to semiconductor lasers, circuits, lasers, etc., can solve the problems of device electrical power changes, inability to provide constant current sources, device optical power changes, etc., and achieve the effect of maintaining stable electrical power

Active Publication Date: 2013-06-19
LEPU MEDICAL TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] What's more serious is that the traditional constant current source circuit will also be affected by temperature changes and cannot provide a stable constant current source, which will cause changes in the electrical power of the device and further cause changes in the optical power of the device

Method used

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Effect test

Embodiment 1

[0035] Figure 4 yes figure 2 The structural representation of the first embodiment of the constant current module in the drive circuit of the semiconductor optical amplifier shown; Figure 4, in this embodiment, the reference voltage circuit 16 is a sliding rheostat 4, the two ends of the sliding rheostat 4 are respectively connected to the power terminal 4 and the ground, and the sliding plate of the sliding rheostat 4 is connected to the slow start circuit 5, The slider end of the sliding rheostat 4 outputs a voltage reference Vref, which is processed by the slow start circuit 5 to output Vst. The non-inverting end of the operational amplifier 6 is connected to Vst, and the inverting end is connected to the end of the resistor 9 having a voltage value. The output of the operational amplifier output signal Verr is introduced through the connection of the inverting terminal of the operational amplifier. The collector of the transistor 8 is connected with the semiconductor...

Embodiment 2

[0039] Figure 5 yes figure 2 The structural representation of the second embodiment of the constant current module in the drive circuit of the semiconductor optical amplifier shown; Figure 5 , in this embodiment, the reference voltage circuit 16 is composed of a voltage regulator tube 12 and a high-precision resistor 11, the accuracy of the circuit is mainly determined by the precision of the resistor 11 and the voltage regulator tube 12, and the resistance accuracy should be less than one percent one. The high-precision resistor 11 is connected to VDD and the operational amplifier 10 through an upper terminal and a lower terminal, respectively. The voltage regulator tube 12 can better ensure the voltage reference and reduce the power consumption caused by directly dividing the voltage through the resistors. Since the load capacity of the front-stage voltage reference circuit is small, the input impedance and output impedance of the circuit can be adjusted through the fi...

Embodiment 3

[0041] Image 6 yes figure 2 The schematic structural view of the third embodiment of the constant current module in the driving circuit of the semiconductor optical amplifier shown; Composed of an operational amplifier 10, the configuration of the voltage reference is completed through digital control, and the personal computer 13 (host computer) sends control commands to the onboard processor 14 through some communication interface, such as USB, RS232, and Ethernet port, etc. , such as Arm, microcontroller, etc. The processor 14 then controls the digital-to-analog converter 15 through the board-level bus and sends voltage data to be converted. The output of the analog interface of the digital-to-analog converter is changed by programming the digital-to-analog converter 15 . After the analog output of the digital-to-analog converter, a first-stage operational amplifier 10 is required to enhance the load-carrying capability of the circuit. This structure can conveniently ...

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Abstract

The invention discloses a drive circuit of a semiconductor optical amplifier, and relates to the technical field of optical coherence tomography. The drive circuit comprises a constant current module. The constant current module comprises a reference voltage circuit, an operational amplifier, an audion and a resistor. A first end of the reference voltage circuit is connected with a power supply terminal, and a second end of the reference voltage circuit is connected with an in-phase end of the operational amplifier. An output end of the operational amplifier is connected with a base electrode of the audion. An emitting electrode of the audion is connected with an opposite phase end of the operational amplifier. The resistor is connected between the point of junction of the emitting electrode of the audion and the opposite phase end of the operational amplifier and the ground. The semiconductor optical amplifier is connected between a collector electrode of the audion and the power supply terminal. According to the drive circuit of the semiconductor optical amplifier, a negative feedback mode is adopted, constant currents are output by using imitation calculation, a constant flow source which can not be influenced by temperature is supplied to the semiconductor optical amplifier, and so that the electric power of the semiconductor optical amplifier is enabled to maintain stable.

Description

technical field [0001] The invention relates to the technical field of optical coherence tomography, in particular to a driving circuit of a semiconductor optical amplifier. Background technique [0002] Optical coherence tomography (Optical Coherence Tomography, OCT) is an imaging technique developed rapidly in recent years, which has the advantages of non-invasive, high-resolution and high-speed imaging. It is especially suitable for the field of biomedicine, and has broad application prospects in fields such as ophthalmology and cardiology. [0003] According to different imaging principles, OCT can be divided into Time Domain Optical Coherence Tomography (TDOCT) and Frequency Domain Optical Coherence Tomography (FDOCT). TDOCT relies on the mechanical scanning of the reference arm to achieve tissue depth scanning, while FDOCT mainly has two implementation methods, one is based on CCD-based spectrometer detection FDOCT (Spectral Domain Optical Coherence Tomography, SDOCT)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042G05F1/66
Inventor 王挺赵士勇王荣军董飒英
Owner LEPU MEDICAL TECH (BEIJING) CO LTD
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