According to a research report from CMSC, optical modules represent a core segment within AI computing infrastructure. Downstream players are persistently increasing capital expenditure on high-speed pluggable optical modules, expanding production capacity to meet rapidly growing demand. Concurrently, ongoing investment in R&D for new technological pathways, such as Co-Packaged Optics (CPO), is unlocking long-term growth potential. Both the industry's capacity expansion cycle and the technology iteration cycle are favorable for equipment suppliers. Furthermore, while optical module production lines historically relied heavily on manual labor, the predominant trend involves major players shifting capacity overseas. To enhance the production efficiency of overseas facilities, demand for automation equipment is continuously rising. Therefore, a focus on the optical module equipment industry is recommended.
Key viewpoints from CMSC are as follows: Pluggable optical modules are core components in optical communications that perform electro-optical conversion and are critical hardware for high-speed interconnects within data centers. Core production processes include die bonding, wire bonding, optical coupling, packaging, welding, and aging testing.
(1) Die Bonding: This involves attaching photoelectric chips onto a substrate, achievable via manual or automatic methods, primarily utilizing die bonders and eutectic bonders. (2) Wire Bonding: After chip attachment, metal wires are used to connect the chip's bonding pads to the pads on the printed circuit board, forming reliable electrical bonds, a process requiring bonders. (3) Optical Coupling: The objective is to couple light into the fiber efficiently and with high quality, ensuring the transmission performance of the optical module. Key equipment includes fully automatic optical coupling platforms and high-precision six-axis fine-tuning platforms. After coupling, fixation is completed using UV curing machines or thermal curing ovens. (4) Packaging: Following optical path coupling, a housing is used to protect, secure, and seal the internal optical path and chips, forming a complete optical module. The industry is undergoing automation upgrades for this step. (5) Aging Testing: This primarily targets lasers. The first stage is at the laser die level, conducted on specialized aging fixtures after essential production steps. The second stage is at the module level, performed using test fixtures after the laser is assembled into the optical module.
Compared to traditional pluggable optical modules, CPO technology offers higher integration and smaller size, with significant improvements in bandwidth, power efficiency, and spatial utilization. Traditional pluggable modules connect to switch PCBs via pluggable interfaces, requiring electrical signals to travel several centimeters across PCB traces, leading to signal attenuation and impacting transmission stability. CPO technology, utilizing advanced techniques like silicon interposers or micro-bump interconnects, integrates optical components directly into the switch ASIC package, reducing high-speed electrical signal transmission distance to the millimeter level, effectively suppressing signal attenuation and crosstalk.
The core difference in production processes between CPO and pluggable modules essentially lies in the distinction between discrete device assembly and advanced system-level integration. (1) Chip Interconnection: Traditional modules primarily use wire bonding; CPO employs advanced interconnection technologies like flip-chip bonding, micro-bumps, and hybrid bonding, which involve higher interconnection density, precision, and difficulty. (2) Optical Coupling: Traditional modules couple fiber with discrete devices, allowing for larger tolerances; CPO involves direct coupling of light into silicon optical waveguides, requiring sub-micron alignment accuracy and higher process complexity. (3) Packaging and Thermal Management: Traditional modules mainly use TO, BOX, and COB packaging with relatively low thermal pressure; CPO requires co-packaging with high-performance ASICs, resulting in extremely high thermal density, often necessitating advanced thermal management processes and equipment like micro-channel liquid cooling, vapor chambers, and vacuum soldering. (4) Testing Systems: Traditional modules allow for component-level testing; highly integrated CPO can only be tested as a whole after packaging, requiring optoelectronic joint test systems and integrated high-speed electrical and optical testing, necessitating the development of new test solutions and equipment.
Risk warnings include fluctuations in downstream demand, risks associated with technological iteration and path selection, and risks related to customer concentration and supply chain dependency.
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