The optical module is among the core parts of the optical fiber communication system and a very powerful a part of the optical communication tools. Its primary perform is to appreciate the conversion of optical and electrical alerts. With the event of the Web, the quantity of community information will increase exponentially, and the development of Web information facilities drives the expansion of the optical module market. As one of many fundamental parts of community building, optical modules are very vital in all the community building.
The packaging type of optical modules can also be continually evolving, the amount is altering in a smaller and smaller course, and the pace, energy consumption, distance, price, and different features are additionally continually shifting ahead. This text focuses on the important thing factors of optical module processing and manufacturing course of management, and easy methods to handle and management such merchandise from the design, technical, and high quality features.
Particular necessities for optical module PCB processing
Optical module merchandise typically have the next traits in keeping with the processing traits. The construction incorporates 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 comparable 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 many others.
Key High quality Requirements for Optical Module Merchandise
1. The corrosion resistance of the plug
The industry-accepted commonplace is that the plug and bond space have to move the porosity, salt spray check, nitric acid fuel check, and combined fuel (high-end product requirement) check.
2. Plug floor high quality necessities
As a result of the sign is transmitted on the floor, it’s not allowed to reveal copper, nickel, palladium, or black spots; floor scratches, uneven defects, copper bumps & copper particles, pinholes, and nicks usually are not allowed; the floor roughness should be inside the management vary.
3. Dimensional tolerance necessities
Plug size and width tolerance management: ±0.1mm; plug heart 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 heart tolerance management: ±0.1 mm.
4. Bonding efficiency necessities
Bonding pad measurement: ≥75 μm; bonding power of 20 μm width gold wire ≥4 g; bleed capability management.
Key Course of Management of Optical Module Merchandise
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1. Plug floor dent management
- There ought 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 sleek floor should be clear).
- Insert the clapboard when eradicating the board.
- Utilizing X-ray drilling + computerized reducing and grinding line manufacturing.
- The vacuum diploma should be managed within the drilling to forestall any mud between the quilt plate or the plate and the plate.
- Grinding therapy earlier than electroplating should be certain 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 should be carried out after electroplating.
- It’s produced by utilizing 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 permit 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 gadget for photoelectric conversion in optical communication, optical modules are broadly utilized in information facilities. Knowledge facilities not solely require high-speed 40G, 100G optical modules and above but additionally require steady evolution in community structure to realize non-blocking community efficiency.
This text is a set of technical information summed up by the creator based mostly on his personal expertise in making optical module PCBs and by consulting related supplies, hoping to be useful to the {industry}.