Ultra-wideband coaxial semiconductor laser internal matching circuit

Abstract

The invention discloses an ultra-wideband coaxial semiconductor laser internal matching circuit which comprises a metal transistor seat, a ceramic substrate and a semiconductor laser tube and further comprises a matching resistor, a matching capacitor and a matching inductor. The radio frequency input pin of the metal transistor seat is electrically connected with the radio frequency input end of the ceramic substrate, and the radio frequency input end of the ceramic substrate is connected with the matching resistor; an optical device power supply input pin of the metal transistor seat is electrically connected with a power supply input end of the ceramic substrate, the power supply input end of the ceramic substrate is connected with one end of the matching capacitor, and the power supply input end of the ceramic substrate and a common connection end of the matching capacitor are connected with one end of the matching inductor, the other end of the matching inductor is connected with one end of the matching resistor and a bonding pad of a cathode of the semiconductor laser diode, and an anode of the semiconductor laser diode is electrically connected with a grounding plane of the top layer of the ceramic substrate. The ultra-wideband coaxial semiconductor laser internal matching circuit has extremely excellent radio frequency performance and small size.

Description

technical field [0001] The present invention relates to the radio over fiber (ROF) field of wireless communication on optical fiber, in particular to an ultra-broadband coaxial semiconductor laser for optical communication transmission and an internal matching circuit thereof. Background technique [0002] The application of ROF technology in microcellular systems has become the focus of attention. It has many advantages such as rich transmission bandwidth, seamless coverage, large capacity, low power consumption, easy installation and maintenance, etc., and can meet the needs of future mobile applications. The broadband business requirement of communication also provides a practicable premise for MIMO mobile communication wireless network. In Japan, ROF has been applied in personal digital communication systems and broadband code division multiple access systems. One of Japan's largest cellular system operators has applied ROF technology to micro-cell and pico-cell signal ...

AI Technical Summary

Problems solved by technology

[0004] At present, the directly modulated broadband semiconductor lasers on the market are mainly based on large-volume butterfly packages. The volume of this laser is very large, which is not conducive to integrated design.

There are also a small number of coaxial packaged semiconductor lasers, but due to the influence of the capacitive inductance effect of the optical device pins in high-frequency applications, the bandwidth of this optical device is not wide, even if a good matching network is made at the module level, the actual measurement The bandwidth is only about 10GHz

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