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US 4,791,632 AGranted
Compensated laser diode transmitter
AssigneeSperry Corporation
InventorsDavid R. Anderson, Vaughn J. Jenkins
Life of this patent
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Abstract
A compensated laser diode transmitter for high speed data transmission is provided with a pair of current switches, a novel current summing circuit and a novel current sink. The power output of the laser is sensed in real data time and employed to generate instantaneous feedback signals capable of instantaneously rebalancing and maintaining the power output of the laser diode.
Claims11
A compensated laser diode transmitter for high-speed data transmission comprising:
- an input current switch for receiving data signals to be transmitted,
- a laser diode coupled to the output of said input current switch and responsive to said data signals for energizing said laser diode into a lasding mode for emitting optical signals,
- a photodiode mounted in close proximity to said laser diode for generating output signals in response to said optical signals,
- an output node summing circuit connected to the output signals of said photodiode,
- a current sink coupled to said laser diode and to said output node of said photodiode and responsive to the current at the output of said photodiode,
- threshold current biasing means connected to said output node for setting the threshold current of said laser diode, and
- current switch means operable by said data signals and coupled to the output of said input current switch and to said output node of said photodiode for balancing the increase in current from said photodiode to continuously maintain a predetermined threshold level when said laser diode is conducting so that changes in the output power of said laser diode are sensed and instantaneously rebalanced by said input current switch to maintain the power output of said laser diode constant.
4 more elements
Dependencies are inferred from the claim text.