The optical module is without doubt one of the core parts of the optical fiber communication system and a very powerful a part of the optical communication tools. Its foremost operate is to comprehend the conversion of optical and electrical alerts. With the event of the Web, the quantity of community knowledge will increase exponentially, and the development of Web knowledge facilities drives the expansion of the optical module market. As one of many primary parts of community development, optical modules are very crucial in your complete community development.
The packaging type of optical modules can be consistently evolving, the amount is altering in a smaller and smaller course, and the pace, energy consumption, distance, price, and different elements are additionally consistently transferring ahead. This text focuses on the important thing factors of optical module processing and manufacturing course of management, and tips on how to handle and management such merchandise from the design, technical, and high quality elements.
Particular necessities for optical module PCB processing
Optical module merchandise typically have the next traits in line with the processing traits. The construction comprises combined stress (excessive frequency + FR-4 or excessive pace + FR-4), managed depth milling, high-precision impedance traces, small spacing between connecting pads, buried copper blocks or buried Particular options akin to ceramics, fantastic traces, lengthy and quick or graded board edge headers, numerous again drilled holes, exact alignment, precision bond pads, nickel palladium gold, and so forth.
Key High quality Requirements for Optical Module Merchandise
1. The corrosion resistance of the plug
The industry-accepted customary is that the plug and bond space have to move the porosity, salt spray check, nitric acid gasoline check, and combined gasoline (high-end product requirement) check.
2. Plug floor high quality necessities
As a result of the sign is transmitted on the floor, it isn’t allowed to show copper, nickel, palladium, or black spots; floor scratches, uneven defects, copper bumps & copper particles, pinholes, and nicks are usually not allowed; the floor roughness have to be inside the management vary.
3. Dimensional tolerance necessities
Plug size and width tolerance management: ±0.1mm; plug middle to board edge tolerance management: ±0.05 mm; plug distance tolerance management: ±0.05 mm; card slot diameter tolerance management: ±0.05 mm; card slot to plug middle tolerance management: ±0.1 mm.
4. Bonding efficiency necessities
Bonding pad measurement: ≥75 μm; bonding energy of 20 μm width gold wire ≥4 g; bleed skill management.
Key Course of Management of Optical Module Merchandise
Picture supply: https://www.fiberopticshare.com/
1. Plug floor dent management
- There needs to be no scratches, pits, scratches, residual glue, and different defects on the floor of the laminated metal plate.
- Use a sticky material to pre-clean the fused board floor earlier than arranging the board.
- Use 35 μm copper foil because the isolation movie to rearrange the board (the graceful floor have to be clear).
- Insert the clapboard when eradicating the board.
- Utilizing X-ray drilling + automated chopping and grinding line manufacturing.
- The vacuum diploma have to be managed within the drilling to forestall any mud between the duvet plate or the plate and the plate.
- Grinding therapy earlier than electroplating should make sure that there is no such thing as a scratching on the board floor.
2. Management of copper nodules on the plug floor
- VCP electroplating + low present density manufacturing.
- Tough grinding and fantastic grinding floor therapy have to be carried out after electroplating.
- It’s produced through the use of a ceramic brush curler grinding line.
3. Brush mark defect management on the plug floor
- Pre-processing of graphic switch: Extremely-roughening therapy doesn’t enable mechanical grinding.
- Pre-treatment of printed resist plating oil: pumice powder therapy can’t be mechanically brushed.
- Secondary dry movie pre-treatment: sandblasting, no grinding.
Because the core machine for photoelectric conversion in optical communication, optical modules are extensively utilized in knowledge facilities. Knowledge facilities not solely require high-speed 40G, 100G optical modules and above but additionally require steady evolution in community structure to attain non-blocking community efficiency.
This text is a set of technical knowledge summed up by the writer based mostly on his personal expertise in making optical module PCBs and by consulting related supplies, hoping to be useful to the {industry}.
