On June 24th, at the AI Data Center Optical Communication and Interconnect Technology Conference held in Seoul, Corning officially launched its glass optical interconnect component, Glass Bridge. This is a glass optical connector designed to directly link photonic integrated circuits (PICs) with optical fibers, primarily targeting the co-packaged optics (CPO) and glass substrate semiconductor packaging markets.
Ko Joo-hyun, Vice President of Corning Optical Communications, stated, "The demand for optical fiber continues to grow, alongside increasing requirements for higher density and performance. Through our GlassWorks AI platform, which integrates technologies from fiber and cable to connectors and optical coupling, we are addressing the needs of next-generation data centers."
Bridging the Size Gap: The Core Logic of Glass Bridge
The fundamental challenge Glass Bridge aims to solve is the long-standing physical compatibility issue between photonic chips and optical fibers.
On-chip optical waveguides are only a few hundred nanometers wide, while the core of an optical fiber measures several micrometers, a difference of tens of times. This is akin to trying to precisely thread a single strand of hair through the eye of a fine needle—direct connection is nearly impossible, necessitating an intermediate transition structure.
Glass Bridge serves as this "transitional bridge." Corning utilizes wafer-level ion-exchange waveguide technology to create optical pathways within the glass, precisely directing light transmitted by the fiber into the photonic chip.
This design offers three direct benefits: enabling high-density optical I/O interfaces at the PIC front-end; simplifying the alignment and assembly process between fibers and photonic devices; and eliminating the need for traditional pluggable transceivers or long fiber array units (FAUs).
The initial product supports a photonic chip core pitch of 30 microns and above, targeting a coupling loss of less than 2dB.
CPO Architecture and Glass Substrates: The Next Strategic Move
In addition to Glass Bridge, Corning also showcased a next-generation CPO architecture that combines glass substrates with optical interconnects.
This design forms optical waveguides on a glass substrate equipped with through-glass vias (TGVs), connecting to flip-chip bonded photonic devices. This approach directly aligns with the semiconductor packaging industry's trend toward migrating to glass substrates—valued for their excellent flatness, low dielectric loss, and high-density wiring capability—which are seen as a key direction for next-generation advanced packaging.
Currently, Corning is co-developing Glass Bridge with multiple partners. Last year, the company announced a collaboration with GlobalFoundries in the field of AI data center optical interconnect technology.
GlassWorks AI Platform: End-to-End Coverage from Chip to Campus
Corning simultaneously introduced the GlassWorks AI platform, positioned as a comprehensive optical communication solution for AI data centers.
The platform covers optical connection infrastructure within data centers, between racks, and across campuses, with a product line encompassing optical fiber, cable, connectors, FAUs, and alignment components.
Regarding production capacity and commercial strategy, Corning has recently expanded investments in its optical communications manufacturing facilities in North Carolina, Texas, and Poland, and has signed multi-billion dollar long-term supply agreements with hyperscale cloud providers including Meta, NVIDIA, and Amazon.
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