Optical fiber transmission repeater and largely dynamic optical receiving-transmitting module

Abstract

The invention discloses a high dynamic optical transceiver, which adds peripheral circuits to a photodetector and a laser on the base of the application of a butterfly packaging laser. The transceiver comprises: a temperature-control circuit used for adjusting the working current of a miniature refrigerator automatically by monitoring the variation of resistance value of thermistance to control the laser to work under a stable temperature condition; a power-control circuit used for adjusting the bias current of a laser diode of the butterfly packaging laser by sampling the voltage of the butterfly packaging laser to stabilize the output power of the laser diode; and an optical power detection circuit used for detecting the optical transmitting / receiving power of the butterfly packaging laser / photodetector and transmitting the detected data to a controller chip. In addition, the invention also discloses a corresponding optical fiber transmission repeater. The optical fiber transceiver of the invention has higher linearity, which is in favor of the gain distribution of the system and the design of a high-power repeater system, has stable performance under high temperature and high production commissioning security.

Description

technical field [0001] The invention relates to a large dynamic optical transceiver module and an optical fiber transmission repeater using the large dynamic optical transceiver module. Background technique [0002] Optical fiber transmission repeater is mainly composed of optical near-end unit, optical fiber and optical remote unit. Both optical near-end unit and optical remote unit include radio frequency unit and optical unit. The radio frequency unit is mainly used to amplify the uplink signal and the downlink signal, and the optical unit is used to convert the photoelectric or electro-optical signal to complete the data transmission between the near-end unit and the far-end unit. In the downlink, the near-end unit converts the received radio frequency signal from the base station into an optical signal, and transmits it to the remote unit through optical fiber. , to cover the target area with signals; the working principle of the uplink is the same, the signal transmit...

AI Technical Summary

Problems solved by technology

[0007] In an ordinary optical transceiver module, affected by the input dynamics of the laser, the maximum input RF power of the module is 5dBm. Considering the reliability of the module under high and low temperature conditions, the RF input power of the module should not exceed 3dBm. Therefore, in high-power optical fiber When designing the repeater system, in order to ensure the transmission power of the system, the gain of the optical remote unit is very high, and the performance of the system’s spectrum transmission template cannot be guaranteed.

At the same time, affected by the linearity of the laser, the output IP3 index of the optical transceiver module can only reach 30dBm. When the optical module is mass-produced, considering the performance consistency of the laser and the debugging efficiency of the module, the output IP3 index is reduced. In this situation, the output IP3 index of the module will deteriorate, thus affecting the linearity of the system

In addition, because the laser shell is connected to +5V voltage, there are potential safety hazards during module debugging, and short circuits are prone to occur, thus damaging the laser

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