Laser drive method and laser drive system
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShigeru Furumiya, Hisashi Senga
Life of this patent
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Abstract
A pulse emitting laser is constantly controlled while recording data continuously to a desired power level without using test emissions or a high speed sample hold filter. The laser drive method detects beam emission power from a light source and generates a monitor wave; receives data and generates an expected wave for the beam power based on the received data; calculates the difference between the generated monitor wave and the expected wave; controls current flow from the bias current source based on the calculated waveform difference; and finally emits a beam from the light source based on the controlled current flow of the bias current source.
Claims8
A laser drive method comprising:
- detecting beam emission power from a light source and generating a monitor wave;
- receiving data;
- generating an expected wave for the beam power based on the received data;
- calculating a waveform difference between the generated monitor wave and the expected wave;
- controlling current flow from a bias current source based on the calculated waveform difference;
- and
- emitting a beam from the light source based on the controlled current flow of the bias current source.
A laser drive system comprising:
- an emission power monitoring unit which detects beam emission power from a light source and generating a monitor wave;
- an expected waveform generating unit which receives data and based on the received data generating an expected wave for the beam power;
- a differential operator which calculates a waveform difference between the monitor wave generated by the emission power monitoring unit and the expected wave generated by the expected waveform generating unit;
- a bias current source which controls current flow based on the waveform difference calculated by the differential operator;
- the laser drive system emitting a beam from the light source based on the current flow controlled by the bias current source.
Dependencies are inferred from the claim text.