What is BS EN 62496-2-4 - Optical circuit boards about?
BS EN 62496 is a series on optical circuit boards. Optical circuit boards are a laminated sandwich structure of conductive and insulating layers. BS EN 62496-2-4 specifies the test method to decide whether to pass or fail an optical circuit board using direct illumination by a light. The input ports are directly illuminated and the optical intensity from the output ports of the optical circuit board is monitored using an area image sensor. Excess optical losses are calculated from the total detected intensities of light from a sample to be measured and from a control sample. This method is used to illuminate uniformly the input port of the optical circuit board (OCB) with a larger area than the core area, obtain the radiance of an area image from the corresponding output port of the OCB using an area image sensor, and evaluate whether to pass or fail using the radiance obtained compared to that of a control sample. The advantage of this test method is that the alignment procedure between a launch fibre and the OCB is not necessary.
Who is BS EN 62496-2-4 - Optical circuit boards for?
BS EN 62496-2-4 on optical circuit boards is useful for:
- Telecommunication component manufacturers
- Telecommunication equipment manufacturers
- Design engineers
- Quality control personnel
Why should you use BS EN 62496-2-4 - Optical circuit boards?
Optical circuit boards can be single-sided (one copper layer), double-sided (two copper layers on both sides of one substrate layer), or multi-layer (outer and inner layers of copper, alternating with layers of the substrate). BS EN 62496-2-4 describes a photodetector that may be mounted on the surface I/O type optical circuit board in an example case. The detecting plane of the photodetector is not on the surface of the optical circuit board. Thus, there is a gap between the surface of the optical circuit board and the detecting plane of the photodetector. Measurement of the centre of a light spot emitted from the optical circuit board at the detecting plane of the photodetector is required. There is a possibility that the position of the output light signal may shift from the I/O port positions when the position of the output light is offset from the port, caused by a deviation of the mirror angle with respect to the surface plane of the optical circuit board as shown in BS EN 62496-2-4 and B.3. The shift of the spot position at the position where an image recording device is placed (offset position) can be calculated by comparison of the offset position of the light beam and the positions of I/O ports of the optical circuit board for measurement. The position of the centre of the light spot at an offset position is calculated as the centre of the observed light spot. Using BS EN 62496-2-4 you can specify the test method to decide whether to pass or fail an optical circuit board using direct illumination by a light.
