Contract analysis

I. INTRODUCTION Plaintiff Optiwave Semiconductor Corp. ("OWS" or "Plaintiff") respectfully submits this Opening Claim Construction Brief pursuant to Patent Local Rule 4-5 and the Court's Case Management Order dated August 15, 2022 (Dkt. No. 45). This brief addresses the construction of eleven disputed claim terms across the four United States patents asserted in this action. OWS is a leading fabless silicon photonics

II. LEGAL STANDARD FOR CLAIM CONSTRUCTION Claim construction is a question of law for the Court. Markman v. Westview Instruments, Inc., 517 U.S. 370, 388–91 (1996). The purpose of claim construction is to determine the meaning and scope of the patent claims, which define the boundaries of the patentee's right to exclude. Id. at 373. The Court's construction of disputed claim terms controls the subsequent determinatio

III. TECHNOLOGY BACKGROUND To assist the Court in understanding the claim terms in dispute, OWS provides the following overview of the relevant technology. A more detailed discussion is set forth in the Declaration of Dr. Harold Whitfield (¶¶ 13–32) and in the Technical Tutorial Presentation submitted concurrently herewith. Silicon Photonics: An Overview Silicon photonics is a technology that integrates optical compo

IV. THE PATENTS-IN-SUIT A. U.S. Patent No. 10,234,567 ("the '567 Patent") The '567 Patent, entitled "Integrated Waveguide Coupler with Tapered Mode Converter for Silicon Photonics Platforms," was filed on March 14, 2017 and issued on March 19, 2019. The named inventors are Dr. Kevin Fong, Dr. Priya Ramanathan, and Hideo Tanaka. The patent is assigned to OWS. OWS asserts Claims 1, 4, 7, 12, and 15 of the '567 Patent i

1. An integrated optical coupler comprising: a tapered silicon waveguide having a tip width of less than 200 nanometers adiabatically coupled to a silicon nitride waveguide layer, wherein the tapered silicon waveguide is configured to convert an optical mode between the silicon waveguide and the silicon nitride waveguide layer with an insertion loss of less than 0.5 dB across a wavelength range of 1260 nm to 1360 nm.

1. A germanium-on-silicon photodetector comprising: a silicon substrate; a graded buffer layer having a continuously varying germanium concentration disposed on the silicon substrate; and a germanium absorber layer disposed on the graded buffer layer, wherein the graded buffer layer reduces threading dislocation density in the germanium absorber layer for enhanced responsivity. Dependent Claims 3, 5, 8, and 11 add li

1. A multi-channel optical transceiver comprising: a silicon photonic die; an integrated wavelength-division multiplexing element monolithically formed on a single silicon die, the WDM element configured to multiplex or demultiplex a plurality of optical channels at different wavelengths; and a plurality of optical modulators and photodetectors formed on the silicon photonic die and optically coupled to the WDM eleme

1. A driver circuit architecture for a high-speed silicon photonic Mach-Zehnder modulator, comprising: a pre-emphasis equalization stage electrically co-integrated with the modulator on a common substrate, the pre-emphasis equalization stage configured to compensate for bandwidth limitations of the modulator by boosting high-frequency components of a drive signal; and a differential output stage coupled to the pre-em

V. DISPUTED CLAIM TERMS AND OWS'S PROPOSED CONSTRUCTIONS A. Disputed Terms of the '567 Patent 1. "adiabatically coupled" (Claims 1, 4, 7, 12, 15). OWS's Proposed Construction: "coupled such that optical mode transitions occur without significant power loss." Lumos's Proposed Construction: "coupled through a gradual, continuous taper that prevents excitation of higher-order modes throughout the entire transition regio