Control circuit for laser wavelength temperature for stabilizing communication

Abstract

The invention discloses a control circuit for laser wavelength temperature for stabilizing communication and relates to the field of optical communication. The circuit comprises a balanced bridge, an integral amplification circuit, a laser bias current indication feedback circuit and a power supply circuit, wherein the balanced bridge comprises a first branch and a second branch; the first branchcomprises a resistor R1, an adjustable resistor RP1, a resistor R8 and a thermistor Rth which are connected in turn; the second branch comprises resistors R2 and R6 which are serially connected; the integral amplification circuit comprises an operational amplifier and resistors R4-R5; the joint of R1 and RP1 is connected to an inverted input end of the operational amplifier through R5; the laser bias current indication feedback circuit comprises a resistor R3 and an adjustable resistor RP2; RP2 is connected to the same phase input end of the operational amplifier through R3 and R4; and one ends of the two ends of R2, R3, R4 and R6 are connected. By using the control circuit provided by the invention, the wavelength adjusting precision and stability of laser are increased and the wavelength shifting caused by the aging laser is compensated.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a temperature control circuit for stabilizing the wavelength of a communication laser. Background technique [0002] The development of the information society requires the use of high-performance, low-price, large-capacity, and high-speed transmission networks. DWDM (Dense Wavelength Division Multiplexing) technology uses the low-loss window of single-mode fiber to simultaneously transmit multiple wavelength carriers on one fiber, which is an effective way for the development of optical fiber communication systems to large capacity and high speed. In order to adapt to the transmission of multiple signals on one optical fiber, the light source used in DWDM equipment requires a specific wavelength. In the current DWDM system, there are mainly two commercial channel spacings: 50 GHz and 100 GHz, among which 50 GHz channel spacing is the mainstream. Since the 50GHz channel spa...

AI Technical Summary

Problems solved by technology

[0006] (1) It is difficult to guarantee the stability and adjustment accuracy of the laser wavelength;

[0007] (2) The aging of the laser will cause wavelength drift

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