Showing papers by "Amnon Yariv published in 1976"
TL;DR: In this article, the possibility of using Bragg reflection to obtain lossless confined propagation in slabs with a lower dielectric constant than that of the surrounding media is proposed and analyzed.
248 citations
TL;DR: In this article, a technique based on nonlinear optical mixing is described for modal phase equalization and recovery of a transmitted image, which limits image transmission in optical fibers to distances too short to be of general interest.
Abstract: Modal phase dispersion limits image transmission in optical fibers to distances too short to be of general interest. A technique based on nonlinear optical mixing is described for modal phase equalization and recovery of a transmitted image.
152 citations
TL;DR: In this paper, it was shown that due to modal dispersion, pictorial information is invariably "smeared" in transmission, and given nature's reluctance to transmit pictures through fibers, is there anything we can do about it?
Abstract: The paper considers two questions. The first one is: Is it possible to transmit three-dimensional pictorial information through transparent glass (or other dielectric) fibers? We find that due to modal dispersion, pictorial information is invariably "smeared" in transmission. The second question is: Given nature's reluctance to transmit pictures through fibers, is there anything we can do about it? We suggest that the answer is yes and point to a class of solutions involving nonlinear optical mixing.
136 citations
TL;DR: A scheme is presented for recovering the transmitted image after distortions brought about by the fiber modes dispersion, and its limitations pointed out.
Abstract: The problem of coherent image transmission through a single multimode optical fiber is discussed. A scheme is presented for recovering the transmitted image after distortions brought about by the fiber modes dispersion. Realization of this scheme by holographic techniques and with lens systems is proposed, and its limitations pointed out. The application of this scheme in canceling out temporal signal dispersion in a multimode fiber transmission line is also discussed briefly.
79 citations
TL;DR: In this paper, the room temperature operation of GaAs distributed Bragg reflector lasers is reported, where the diodes are fabricated from conventional double heterostructures involving only a single step of liquid-phase epitaxy.
Abstract: Room-temperature operation of GaAs distributed Bragg reflector lasers is reported. The diodes are fabricated from conventional double heterostructures involving only a single step of liquid-phase epitaxy. For gratings with a period of 3700 A, the diodes lased at 8770 A, which corresponds to the high-absorption side of the spontaneous emission spectrum. Thresholds as low as 6 kA/cm^2 have been realized.
30 citations
Patent•
26 Mar 1976
TL;DR: In this article, a dc electric field is utilized to remove spatial inversion symmetry of NH 2 D gas molecules contained in a Stark cell, resulting in the generation of a laser beam at the difference frequency f 3 = f 1 - f 2.
Abstract: In the disclosed parametric frequency converter a dc electric field is utilized to remove spatial inversion symmetry of NH 2 D gas molecules contained in a Stark cell. Simultaneous introduction into the Stark cell of a laser beam at a frequency f 1 (e.g., corresponding to about 10.6 μm) and microwaves at a frequency f 2 (e.g., about 4.1 GHz) produces resonantly enhanced parametric mixing of the frequencies f 1 and f 2 , resulting in the generation of a laser beam at the difference frequency f 3 = f 1 - f 2 .
26 citations
TL;DR: In this article, an equivalent cavity approach is used to derive the oscillation condition of a distributed Bragg reflector laser, and the effect of lossy reflectors is discussed.
17 citations
TL;DR: In this paper, room-temperature embedded double-heterostructure injection lasers have been fabricated using selective liquid phase epitaxial growth, achieving threshold current densities as low as 1.5 kA/cm^2.
Abstract: Room-temperature embedded double-heterostructure injection lasers have been fabricated using selective liquid phase epitaxial growth. Threshold current densities as low as 1.5 kA/cm^2 have been achieved in lasers grown through stripe windows opened in epitaxial GaAlAs masks.
14 citations
Proceedings Article•
01 Jan 1976
TL;DR: Incorporation of GaAlAs potential barrier layers into the active regions of a heterostructure pnpn injection laser makes it possible to design Shockley diode lasers with low room-temperature threshold currents.
Abstract: Incorporation of GaAlAs potential barrier layers into the active regions of a heterostructure pnpn injection laser makes it possible to design Shockley diode lasers with low (3 kA/cm^2) room-temperature threshold currents.
11 citations
6 citations
TL;DR: In this article, a simple pulse generator, providing continuous variation of current amplitude (0.1 − 35 A) and pulse width (100 − 700 nsec), is described, which is used for operating injection lasers at repetition rates up to 5 kHz.
Abstract: A simple pulse generator, providing continuous variation of current amplitude (0.1–35 A) and pulse width (100–700 nsec) is described. This pulser has been used for operating injection lasers at repetition rates up to 5 kHz.
01 Sep 1976
TL;DR: In this article, the authors developed and demonstrated techniques for efficiently coupling a semiconductor injection laser source to a hybrid optical integrated circuit (HOIIC) with the specific design objectives of producing and delivering two hybrid coupled laser/waveguide sources.
Abstract: : The objective of this program was to develop and demonstrate techniques for efficiently coupling a semiconductor injection laser source to a hybrid optical integrated circuit. The specific design objectives were to produce and deliver two hybrid coupled laser/waveguide sources in which the laser was operated at 300 rk, driven with 20 to 250 nls length pulses at a repetition rate up to 104 P.P.S, emitting light at a wavelength between 0.8 micrometers into a thin film planar waveguide or either Ta205 or Nb205. At least one watt of peak optical power was to be coupled into the lowest order waveguide mode with a coupling efficiency of greater than 10%. All of the stated program objectives were achieved and in some cases surpassed. The approach used was to couple commerically avialable (GaAl) as laser diodes to thin film planar waveguides in a direct end-butt coupling arrangement.