Ferrite bead, bias circuit, optical module, and communication device

An optical module, comprising a housing and a bias circuit disposed in the housing, wherein the bias circuit comprises:

• a substrate and at least one ferrite bead that is disposed on the substrate, wherein a trace, a first pad, and a second pad are disposed on the substrate, the second pad is configured to fasten the at least one ferrite bead, a first electrical connection end of the at least one ferrite bead is connected to the first pad, and a second electrical connection end of the at least one ferrite bead is connected to the trace;
• wherein
• the at least one ferrite bead comprises:
• a ferrite bead body, the first fastening terminal, the second fastening terminal, and an external terminal, wherein
• each of the first fastening terminal and the second fastening terminal is connected to the ferrite bead body, and is configured to fasten the ferrite bead body;
• the ferrite bead body comprises a coil structure, the coil structure has a first electrical connection end and a second electrical connection end, the external terminal is disposed on a surface of the ferrite bead body, and at least one of the first electrical connection end and the second electrical connection end is electrically connected to the external terminal;
• and
• an area of the external terminal is less than each of an area of the first fastening terminal and an area of the second fastening terminal.