Laser driving method and laser driving device
AssigneeSony Corporation
InventorsKatsunori Sato, Toru Nagara
Life of this patent
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Abstract
Disclosed herein is a laser driving method including the step of adjusting an initial value of driving current for driving a laser when an operation mode is changed on a basis of a difference in magnitude between a first bias current including information on threshold current of the laser in a first operation mode and a second bias current including information on the threshold current in a second operation mode.
Claims18
A laser driving method for driving a laser, said laser driving method comprising the step of:
- adjusting an initial value of a driving current for driving said laser when an operation mode is changed on a basis of a difference in magnitude between a first bias current comprising information on threshold current of said laser in a first operation mode and a second bias current comprising information on said threshold current in a second operation mode, and
- performing pulse driving of said laser by generating a combined current by superimposing a current pulse for generating a light emission waveform of multilevel power on bias current comprising information on the threshold current of said laser, and supplying the combined current to said laser,
- wherein said first operation mode is a reproduction mode, and said first bias current is the driving current in said reproduction mode, and said second operation mode is a recording mode, and said second bias current is a current on which said current pulse is superimposed in the driving current in said recording mode.
A laser driving device for driving a laser, said laser driving device comprising:
- an initial current value adjusting unit for adjusting an initial value of driving current for driving said laser when an operation mode is changed on a basis of a difference in magnitude between a first bias current comprising information on threshold current of said laser in a first operation mode and a second bias current comprising information on said threshold current in a second operation mode,
- wherein said laser driving device performs pulse driving of said laser by generating a combined current by superimposing a current pulse for generating a light emission waveform of multilevel power on a bias current component providing the threshold current of said laser, and supplying the combined current to said laser;
- said first operation mode is a reproduction mode, and said first bias current is the driving current in said reproduction mode;
- and said second operation mode is a recording mode, and said second bias current is the current on which said current pulse is superimposed in the driving current in said recording mode.
A laser driving method for performing pulse driving by generating a combined current by superimposing a current pulse for generating a light emission waveform of multilevel power on a bias current comprising information on threshold current of a laser, and supplying the combined current to said laser, said laser driving method comprising the step of:
- adjusting an initial value of driving current for driving said laser when an operation mode is changed on a basis of a difference in magnitude between a first bias current that comprises information on the threshold current of said laser in a reproduction mode and is the driving current in said reproduction mode and a second bias current that comprises information on said threshold current in a recording mode and is the current on which said current pulse is superimposed in the driving current in said recording mode.
A laser driving device for performing pulse driving of a laser by generating a combined current by superimposing a current pulse for generating a light emission waveform of multilevel power on a bias current component providing threshold current of said laser, and supplying the combined current to said laser, said laser driving device comprising:
- an initial current value adjusting unit for adjusting an initial value of driving current for driving said laser when an operation mode is changed on a basis of a difference in magnitude between a first bias current that comprises information on the threshold current of said laser in a reproduction mode and is the driving current in said reproduction mode and a second bias current that comprises information on said threshold current in a recording mode and is the current on which said current pulse is superimposed in the driving current in said recording mode.
Dependencies are inferred from the claim text.