Optical repeater integrated lasers
First Claim
1. In a plural layer semiconductor diode laser which is electrically biased to the point wherein light input causes the laser to commence lasing such that the improvement is characterized by:
- a first substrate layer (1) of a semiconductive crystal,a second layer (2) of a semiconductive crystal with a predetermined bandgap,a third layer (3) of a semiconductive crystal with a bandgap relatively smaller than that of said second layer,a fourth layer (4) of a semiconductive crystal with a bandgap similar to that of said second layer,a fifth layer (5) of a semiconductive crystal with a bandgap between that of said second layer and said third layer,a sixth layer (6) of a semiconductive crystal with a bandgap similar to that of said second layer,wherein when said electrical bias (V) is slightly less than the breakdown voltage of the back biased junction between the fourth and fifth layers thereof, and external light (8,
9) is supplied to the fourth or fifth layers, said back biased junction between said fourth and fifth layers becomes forward biased so as to stimulate the emission of laser light from the third layer.
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Abstract
Integrated laser diode devices are utilized as repeater elements and logic circuit elements in fiber optic and other light transfer systems. One embodiment discloses a six layer device (10) which is triggered not by an external electrical gating source, but by an external light source (8, 9) as from an optical fiber. Another embodiment operates a laser diode in a bilateral mode. That is, depending on the polarity of the applied voltage bias V to the device (50), two separate light pulses are emitted from different regions (56, 52) of the crystal. A further embodiment utilizes the semiconductor laser as a logical AND function. When the electrical bias (V) of the device (60) is set so that when at least two external light sources (67, 68) are applied, the device will emit laser light (69). Still another embodiment utilizes two semiconductor laser devices (911, 913) as an astable optical multivibrator (90).
21 Citations
5 Claims
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1. In a plural layer semiconductor diode laser which is electrically biased to the point wherein light input causes the laser to commence lasing such that the improvement is characterized by:
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a first substrate layer (1) of a semiconductive crystal, a second layer (2) of a semiconductive crystal with a predetermined bandgap, a third layer (3) of a semiconductive crystal with a bandgap relatively smaller than that of said second layer, a fourth layer (4) of a semiconductive crystal with a bandgap similar to that of said second layer, a fifth layer (5) of a semiconductive crystal with a bandgap between that of said second layer and said third layer, a sixth layer (6) of a semiconductive crystal with a bandgap similar to that of said second layer, wherein when said electrical bias (V) is slightly less than the breakdown voltage of the back biased junction between the fourth and fifth layers thereof, and external light (8,
9) is supplied to the fourth or fifth layers, said back biased junction between said fourth and fifth layers becomes forward biased so as to stimulate the emission of laser light from the third layer. - View Dependent Claims (2, 3, 4, 5)
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Specification