Laser diode and transmitter module

摘要

A transmitter module that includes a laser diode (LD) and a driver, each mounted on a sub-mount, is disclosed. The driver directly drives the LD by supplying a modulation signal, a bias signal, and a reference. Two signals are provided to a first pad of the LD, while, the reference is provided to the second pad of the LD. The second pad in the center thereof is formed relatively closer to the second facet of the LD opposite to the first facet through which the laser light is emitted.

主权项

1. A transmitter module comprising:
a laser diode (LD) having a first facet to emit light and a second facet opposite to the first facet, the LD having a first pad and a second pad, and a first conductivity-type semiconductor layer and a second conductivity-type semiconductor layer; a driver set as facing the second facet of the LD, the driver directly driving the LD by supplying a bias signal and a modulation signal to the first pad of the LD; a first bonding wire connecting the first pad to the driver to provide the modulation signal; and a second bonding wire connecting the second pad of the LD to the driver; wherein the first pad of the LD is connected with the driver to receive the bias signal, wherein the second pad of the LD is positioned closer to the second facet relative to the first facet, wherein the first pad is electrically connected to one of the first and second conductivity-type semiconductor layers, and the second pad is electrically connected to the other of the first and second conductivity-type semiconductor layers, and wherein the first and second pads have first and second lengths, respectively, each of the first and second lengths is defined as a length taken along a first direction from the first facet to the second facet, and the second length is smaller than the first length.