Abstract: A lighting module includes a lighting unit, a cylindrical optical element, a supporting unit, and a base. The supporting unit connects the base and a part of the supporting unit is higher than a junction of the base and the supporting unit. The lighting unit is disposed on the base and includes a lighting surface emitting a light beam. The cylindrical optical element includes an incident surface and both ends of the cylindrical optical element are respectively connected to the supporting unit making the incident surface facing the lighting surface and having an interval from the lighting unit to the incident surface, and the light beam enters the cylindrical optical element from the incident surface. The lighting module satisfies the following condition: 2?D/E?6; wherein D is a diameter of the cylindrical optical element and E is the interval from the lighting unit to the incident surface.

Abstract: A receiver module includes an optical fiber configured to transmit a light beam, a collimating lens configured to collimate the light beam, a condensing lens configured to condense the light beam, and a light receiver including a sensor and a lens. The lens is disposed on the sensor, the lens and the sensor are connected to each other, and the sensor includes a light sensing zone. The condensing lens and the light receiver are disposed with respect to each other, and the light beam propagates sequentially through the optical fiber, the collimating lens, the condensing lens and the lens, and is incident on the sensor.