Abstract: A light string system includes a plurality of LED's connected in parallel and a regulated power supply for providing a constant current and a constant voltage to the LED's. The light system may be used for decorative, signaling and a variety of other applications.

Abstract: Frequency modulated light is provided to an optical fiber by exciting a laser medium, such as a diode laser, so that stimulated emitted radiation, at a fixed wavelength .lambda., emanates from opposite surfaces of the medium. One end of the fiber is coupled to one of the surfaces. A reflecting medium is provided a distance (n.lambda.)/4 away from the other of the surfaces (n being a positive integer) to reflect emanated radiation from the other surface back to the other surface. The reflecting medium is oscillated in accordance with a signal to be modulated. The radiation reflected back to the other surface tends to cancel or reinforce, respectively, the radiation that emanates from the one surface, when n is an odd integer or an even integer, respectively. The reflecting medium can be a light reflecting diaphragm adapted to be acoustically oscillated.

Abstract: A new method for increasing the modulation bandwidth of InGaAsP lasers is described herein. The method of the present invention is based on the gain enhancement doping of the lasers active layer. Lasers with highly doped active regions were demonstrated to have larger modulation bandwidths than lightly doped devices.

Abstract: Apparatus couples optical fiber to an optoelectronic component with a collet, a cylindrical member, a connector, and hermetically sealing means. The collet has a central orifice through a knurled end portion, a central portion with a male thread, and a second end portion formed with a slotted cone sleeve. The cylindrical member has opposed centrosymmetric recesses that meet, forming a small axially oriented aperture. One recess is formed with an axial female thread, with a conical indentation terminating at the aperture. The female thread can to engage with the collet male thread. Thread engagement of member and collet results in engagement of the member at the conical indentation with the coned sleeve, drawing the slotted sides inwardly, firmly gripping the collet held optical fiber. The other recess has a second axial female thread from the opposite end of the member toward the aperture. The member has a radially directed sight hole.