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Method and device for optically transmitting data

  • US 9,319,134 B2
  • Filed: 04/28/2010
  • Issued: 04/19/2016
  • Est. Priority Date: 04/28/2009
  • Status: Expired due to Fees
First Claim
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1. A method for optically transmitting data using a pulse-width-modulated light source, the method comprising:

  • specifying a pulse duty factor of a pulse width modulation to set the brightness of the light source as a ratio between a blanking time of the light source and a period of a pulse width modulation cycle, wherein a difference between the period and the blanking time corresponds to a bright-up time of the light source within one pulse width modulation cycle, anddividing the bright-up time of the pulse width modulation cycle into a plurality of partial bright-up times separated by at least one blanking to transmit a data symbol,wherein each blanking has a selected start time and time period,wherein the data symbol transmitted during the pulse width modulation cycle is defined as a function of the respective start times of all of the blankings within that pulse width modulation cycle,wherein the sum of the partial bright-up times within the pulse width modulation cycle essentially corresponds to the bright-up time according to the specified pulse duty factor; and

    providing training sequences at least at the start of a data transmission.

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