Browse Prior Art Database

Solid State Exclusive OR Device

IP.com Disclosure Number: IPCOM000094669D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Kelly, CE: AUTHOR

Abstract

With certain configuration and suitable fabrication technique, it is possible to incorporate two lasers in one block of semiconductor material. The lasing beam from one laser is turned on and off by the current input to a second laser section. Thus, the device performs the exclusive or function.

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Solid State Exclusive OR Device

With certain configuration and suitable fabrication technique, it is possible to incorporate two lasers in one block of semiconductor material. The lasing beam from one laser is turned on and off by the current input to a second laser section. Thus, the device performs the exclusive or function.

The optical output from the laser is influenced by the light emitted from the quencher. If the quencher section is emitting spontaneous emission, this light pumps the laser and lowers its threshold, thus increasing its optical output. If the quencher section is emitting stimulated emission, it raises the threshold of the laser, thus quenching the laser beam. Therefore, if the laser is biased just below threshold current, the coherent beam from the laser can be turned on. This is effected by supplying an input to the quencher which biases the quencher to some point below its threshold current. The beam from the laser can be turned off by supplying a second input to the quencher. The second input, together with the first input, biases the quencher above its threshold current.

The device is fabricated by using a substrate material of n type GaAs Te doped n = 2 x 10/18/ (cm/3/)/-1/. SiO(2) is deposited on the substrate. A photolithographic technique is used to etch a pattern in the SiO(2) mask, resulting in SiO2 strips on the GaAs surface. Zn is then diffused using Au NiAu plating for the contacts and the SiO(2) is removed. The four-sided unit...