Browse Prior Art Database

Modulating Contacts to a Injection Laser

IP.com Disclosure Number: IPCOM000094611D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 19K

Publishing Venue

IBM

Related People

Williams, HB: AUTHOR [+2]

Abstract

This semiconductor laser has two or more contacts to produce lasing according to a summation of the currents of the individual contacts. A multiple contact laser provides the advantage that the input signals are kept electrically isolated. The drawing shows a multiple contact laser arranged for multiplexing in an optical communications system.

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Modulating Contacts to a Injection Laser

This semiconductor laser has two or more contacts to produce lasing according to a summation of the currents of the individual contacts. A multiple contact laser provides the advantage that the input signals are kept electrically isolated. The drawing shows a multiple contact laser arranged for multiplexing in an optical communications system.

In the system, the laser cavity is provided with a primary contact and several secondary contacts. The primary contact receives a time invariant biasing current Ib somewhat above the threshold for lasing. Each secondary contact receives a polarity varying carrier signal Im1 and Im2 of a different frequency that is modulated according to the variable it represents. The laser produces a light output that varies according to the sum of the secondary contact currents. This light is directed to a receiving station provided with a suitable demodulator.

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