A kind of circuit board and optical module

Abstract

The embodiment of the invention discloses a circuit board and an optical module. The circuit board in this scheme is applied in the optical module, and the laser driver chip and filter capacitor unit are arranged on the circuit board; wherein, the laser driver chip has a CDR circuit; the CDR circuit has a frequency locking pin and a reference ground pin; the circuit board is also provided with a stacked ground layer, an insulating layer and a wiring layer; wherein, one end of the filter capacitor unit passes through the first wiring of the wiring layer and the frequency-locking pin The other end is connected to the reference ground pin through the second trace of the trace layer; wherein: a node on the second trace is connected to the ground layer through a via hole, so that the filter capacitor The cell and reference ground pins are connected to ground. In the existing optical module, the problem of poor working stability of the CDR circuit of the laser driver chip under extreme conditions is solved.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a circuit board and an optical module. Background technique [0002] In optical communication, the optical module can realize photoelectric conversion. With the rapid development of the optical communication industry, the transmission rate and distance of the communication network have increased significantly, and the dispersion and link attenuation have become more serious. High requirements, using a laser driver chip with clock and data recovery (Clock and data recovery, CDR) function, can realize clock recovery extraction, so that the distorted signal can be recovered, improve the signal quality, improve the sensitivity of signal recognition, and increase the link margin to improve robustness. [0003] The CDR technology integrated in the laser driver chip of the optical module is relatively mature, see figure 1 As shown in the optical module 101, one end of th...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the embodiment of the present invention is to provide a circuit board and an optical module, which is used to solve the problem of poor working stability of the CDR circuit of the laser driver chip in the harsh low temperature environment in the existing optical module

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