US 2026/0219464 A1Published application

Optical module

AssigneeInnoLight Technology (Suzhou) Ltd.

InventorsXigui Fang, XIAN ZHOU

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Abstract

An optical module. In the optical module, a bare die is directly flip-mounted on a circuit board of the optical module, such that high-speed signals on a host side and a line side can directly enter the interior of the bare die through an electrical interface of the circuit board into the circuit board. Therefore, the link of high-speed signals can be simplified, impedance abrupt change points are reduced, the transmission stability of the high-speed signals is improved, the integrity of the signals is improved, the transmission rate is improved, and the optical module with a higher rate is implemented. Moreover, the thermal expansion coefficient of a first insulating dielectric layer of a core layer structure of the circuit board matches the thermal expansion coefficient of the bare die, which can effectively improve the reliability of the bare die flip-mounted on the circuit board.

Claims16

Dependent claims

An optical module, comprising:

a housing,
and an optical assembly, a circuit board, a bare die and a surface-mount component disposed in the housing;
wherein, the circuit board comprises:
a core layer structure, comprising a first insulating dielectric layer and a first conductive circuit layer laminated on both sides of the first insulating dielectric layer;
and
at least two build-up layer structures are symmetrically laminated on both sides of the core layer structure;
wherein, the two outermost layers of the at least two build-up layer structures are provided with a surface layer circuit pattern on the surface on the side of each away from the core layer structure, and the surface layer circuit pattern comprises a fine flip-chip circuit, a surface-mount circuit and an electrical interface;
and
the bare die is flip-chip mounted on the fine flip-chip circuit, the surface-mount component is mounted on the surface-mount circuit, and the electrical interface is configured for pluggable electrical connection with the outside.

6 more elements

Dependencies are inferred from the claim text.