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US 2026/0246536 A1Published application
CDMA Over WDM for Light Source Frequency Locking
AssigneeNVIDIA Corporation
InventorsSegev Binyamin Zarkovsky, Shai Cohen
Life of this patent
Estimating the term…
Abstract
An optical transmitter includes lasers configured to generate a wave division multiplex (WDM) on a light guide, and a Code Division Multiple Access (CDMA) symbol generator coupled to modulate CDMA symbols on the light guide across the channels of the WDM. The transmitter utilizes of laser locking controls configured to correlate the CDMA symbols to frequency adjustments applied to the lasers.
Claims23
An optical system comprising:
- a light guide;
- a plurality of lasers configured to generate respective optical carriers at different wavelengths to form a wavelength division multiplexed (WDM) signal on the light guide;
- a Code Division Multiple Access (CDMA) symbol generator configured to generate CDMA symbols based on orthogonal codes;
- modulation circuitry configured to superimpose the CDMA symbols onto the WDM signal across a plurality of the wavelengths;
- a correlator configured to correlate the detected CDMA symbols with a selected orthogonal code to identify a corresponding one of the plurality of lasers;
- and
- a control circuit configured to generate a bias adjustment for the corresponding laser to correct a wavelength offset of the corresponding laser.
4 more elements
An optical transmitter comprising:
- a plurality of lasers configured to emit optical signals at respective wavelengths;
- an optical combiner configured to combine the optical signals into a wavelength division multiplexed (WDM) signal;
- a CDMA symbol generator configured to generate spread-spectrum control symbols based on orthogonal codes;
- a bias modulation circuit configured to modulate bias currents of the plurality of lasers to encode the CDMA symbols onto corresponding wavelengths of the WDM signal, wherein the CDMA symbols are distributed across multiple wavelengths such that each wavelength carries a portion of a CDMA signal;
- and
- control circuitry configured to adjust laser bias currents based on feedback derived from correlation of the CDMA symbols . . . .
3 more elements
A method of optical communication comprising:
- generating, by a plurality of lasers, optical signals at respective wavelengths;
- combining the optical signals into a wavelength division multiplexed (WDM) signal on a light guide;
- generating Code Division Multiple Access (CDMA) symbols based on orthogonal codes;
- superimposing the CDMA symbols onto the WDM signal across multiple wavelengths;
- tapping a portion of the WDM signal from the light guide;
- detecting the CDMA symbols within the tapped portion;
- correlating the detected CDMA symbols with a selected orthogonal code to identify a corresponding laser;
- and
- adjusting a bias current of the corresponding laser based on the correlation to reduce a frequency offset of the corresponding laser.
6 more elements
Dependencies are inferred from the claim text.