Infinera‘s patent involves optical network systems with a transmitter using digital signal processing to generate optical subcarriers for clock recovery. The receiver includes photodiodes, ADC circuitry, a digital signal processor, and clock recovery circuit for data output based on the clock signal. GlobalData’s report on Infinera gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Infinera, Data center optical networking was a key innovation area identified from patents. Infinera's grant share as of January 2024 was 63%. Grant share is based on the ratio of number of grants to total number of patents.

Optical network system with clock recovery

Source: United States Patent and Trademark Office (USPTO). Credit: Infinera Corp

A recently granted patent (Publication Number: US11881898B2) discloses a receiver system comprising multiple photodiodes designed to receive a modulated optical signal with distinct optical subcarriers of varying frequencies. The second optical subcarrier carries essential clock information, with its frequency positioned between the first and third optical subcarriers. Analog-to-digital converter circuitry processes the photodiode outputs into digital samples, which are then filtered by a digital signal processor. A clock recovery circuit within the processor generates a clock signal based on the digital samples, enabling the output of data synchronized with the clock signal.

The patent also details the use of Nyquist optical subcarriers in the receiver system, with the clock recovery circuit integrated into the digital signal processor. Additionally, the spectral characteristics of the optical subcarriers are highlighted, with the second optical subcarrier having a wider spectral width compared to the first and third subcarriers. The spacing between the optical frequencies is also specified to be different between the first and second subcarriers and the second and third subcarriers. Furthermore, the receiver system includes a local oscillator laser and optical hybrid circuitry to mix the local oscillator signal with the modulated optical signal for processing by the photodiodes, ensuring accurate reception of the optical data.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.