PCB News - Process capability of optical fiber circuit board

Process capability of optical fiber circuit board

1. Product definition

Optical fiber circuit boards are also called optoelectronic products, commonly known as optical communication products.

Scope of application

Communication short-distance signal transmission.

2. Product features

1. Ultra-small optical fiber circuit board(3-5 square centimeters);

2. The precision is high, and the small optical fiber circuit board must be packaged with IC, and some high-levels have blind buried vias and even HDI (Huawei 5G products are part of HDI second-order). Talk about the next second-order HDI design;

3. The shape is attached and the tolerance is tight, and the iron shell is fixed, the card is not tight when it is small, and it cannot be put in when it is large. (Some companies control according to the third-level standard, and the Huawei standard is higher than the third-level standard);

4. The PCB fiber board adopts long and short golden finger technology.

3. Commonly used plates and accessories for optical fiber circuit boards

1. Conventional FR-4 fiberglass circuit board, used in the old version many years ago;

2. M6 board, now part of the upgraded version is used;

3. Rogers, high signal frequency is used more, especially Huawei products.

4. Difficulties in the production process and the advantages of Circuit Board Factory.

1. The shape of the optical fiber circuit board is complicated, and the molding cost is high (the cost of outsourcing is about 4 cents a square centimeter)

2. Small batches, small drilling machines have high working costs (model factories are laborious in batches), and large batches are too small to be taken seriously-Zhongke Circuits uses 6-axis drilling machines;

3. High appearance requirements. The copper plug hole must not be falsely exposed, and the gold surface must not be scratched. --The plug hole is very full, and it is a professional user of sinking gold processing;

4. High requirements on the precision of the shape and size, and the equipment must be good (otherwise it cannot be put in or loosened)-20 sets of new shape machine tools;

5. High line accuracy is required, and data transmission must be stable. --LDI machine;

6. The quantity is large, the customer complaints are frequent, the return situation often occurs, the business service requirements are high (proficient in technology, understand the process, and can quickly solve the problem), and the 8D customer complaint post has very high requirements for cooperation.

All in all, it is easy to find a manufacturer that produces circuit boards, but it is really not easy to find a manufacturer of good multilayer circuit boards for fiber optic boards, because fiber optic boards have high requirements and complex shapes.

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