Light transmitter

A light transmitter, comprising:

• a substrate;
• a semiconductor refrigeration assembly arranged on the substrate;
• a light emitting assembly mounted on the semiconductor refrigeration assembly, so that the semiconductor refrigeration assembly cools the light emitting assembly, and the light emitting assembly being configured to generate a laser beam;
• a tube shell mounted on the substrate to package the semiconductor refrigeration assembly and the light emitting assembly;
• an optical fiber configured to output the laser beam generated by the light emitting assembly to an outside of the tube shell;
• and
• a transparent filling glue filled in a space between an inner wall of the tube shell and the substrate, and configured to guide the laser beam generated by the light emitting assembly to the optical fiber and transfer a heat generated by the light emitting assembly to the tube shell,
• wherein the semiconductor refrigeration assembly comprises a first refrigeration portion and a second refrigeration portion configured to perform refrigeration independently of each other, and a first pin, a second pin, a third pin and a fourth pin of the first refrigeration portion and the second refrigeration portion extend out of the tube shell parallel to a mounting surface of the substrate, and
• the light emitting assembly comprises:
• a light emitting portion mounted on the first refrigeration portion and configured to generate the laser beam;
• and
• a light guide portion mounted on the second refrigeration portion and configured to guide the laser beam to the optical fiber,
• wherein the light emitting portion comprises:
• a laser device chip configured to generate the laser beam, the laser beam being split into a first laser and a second laser;
• and
• a backlight detector configured to monitor a working state of the laser device chip according to the first laser received, a fifth pin and a sixth pin of the backlight detector extending out of the tube shell parallel to the mounting surface of the substrate,
• wherein the light guide portion comprises:
• two lenses mounted on an optical path of the second laser in sequence and configured to adjust an optical field of the second laser, so as to reduce a coupling loss in a transmission process of the second laser;
• and
• an optical isolator mounted between the two lenses to reduce an influence of a reflected light on the laser device chip in the transmission process of the second laser,
• wherein the laser device chip comprises a light emitting diode, a positive electrode of the light emitting diode is connected with a seventh pin extending out of the tube shell parallel to the mounting surface of the substrate;
• a negative electrode of the light emitting diode is electrically connected with a matching resistor and a first end of an inductor, the matching resistor is configured to match a resistance of the light emitting diode and a resistance of an internal circuit of the tube shell, the inductor is configured to isolate an alternating current signal of a current;
• and
• the matching resistor and a second end of the inductor are respectively connected with an eighth pin and a ninth pin extending out of the tube shell parallel to the mounting surface of the substrate.