Abstract: Disclosed is an optical floating sub-assembly, comprising a thermally conductive non rigid substance between the heat sink carrier and external casing, to minimize mechanical stress on the optical assembly. Also disclosed is a printed circuit board as an electrical interface, comprising two modules capable of converting an electrical signal to an optical signal, transmitting the optical signal and then converting the optical signal back to an electrical signal. Also disclosed is an optical assembly, comprising a heat sink with mechanical features for optical alignment.

Abstract: An optical sub-assembly is disclosed, having a mating end adapted to receive a mating fiber, and a back end provided with a converging lens establishing an expanded beam interface with an optical device. The use of an expanded beam interface provides greatly improved stability, and reduces the sensitivity to slight misalignments The optical sub-assembly comprises a receptacle for which the manufacturer thereof has full control over the optical interfaces and refractive index boundaries. The receptacle and the optical device may be manufactured separately.

Abstract: The present invention relates to an optoelectrical unit for converting information signals between an electrical signal format and an optical signal format. The proposed unit includes a circuit board, which contains at least one optoelectrical capsule. Each capsule is positioned on the circuit board, such that its footprint towards the circuit board has a smaller area than the area of a largest side of the capsule. Moreover, each capsule includes a feedthrough, which electrically connects one or more components therein to circuitry on the circuit board via a plurality of leads. The feedthrough also contains a shield, which electrically shields at least one signal lead from at least one auxiliary lead. The feedthrough is adapted for positioning the optoelectrical capsule at an arbitrary adapted location on the circuit board.

Abstract: The present invention relates to optimization of communication equipment with respect to size and undesired signal interference. To this aim a ceramic feedthrough interconnection assembly is proposed in order to transport an electrical information signal to and from a communication capsule. In addition to at least one signal lead (103a, 103b) for communicating an electrical information signal, the assembly contains at least one auxiliary lead and a shield (103c, 103d, 104, 104a, 104b, 104f) that electrically shields the at least one signal lead (103a, 103b) from the at least one auxiliary lead. The shield (103c, 103d, 104, 104a, 104b, 104f) has such dimensions (d1, d2) and is positioned at such distance (d3, d4, d12) from the at least one signal lead (103a, 103b) that the electrical information signal experiences a well-defined and substantially constant impedance in the assembly. This in turn, minimizes the risk of undesired signal reflections. At the same time the assembly allows a high lead density, i.e.

Abstract: An integrated device is provided having both laser and modulator sections. The laser section generates a primary light signal using a distributed feedback process. The modulator section influences the primary light signal by means of an electroabsorption process. The laser and modulator sections are electrically separated from each other with respect to anode and cathode areas. As a result, a single supply voltage can be used to operate the device. An optical transmitter contains, in addition to the integrated device, a protocol converter which receives an information signal to be transmitted and generates a control signal which is received by a modulator driver. Based thereon, the modulator driver produces a modulating signal, which causes a modulated light signal representing the information signal to be output. A laser bias control unit controls the output power level of the primary light signal based on a leak signal from the laser section.

Abstract: An integrated device is provided having both laser and modulator sections. The laser section generates a primary light signal using a distributed feedback process. The modulator section influences the primary light signal by means of an electroabsorption process. The laser and modulator sections are electrically separated from each other with respect to anode and cathode areas. As a result, a single supply voltage can be used to operate the device. An optical transmitter contains, in addition to the integrated device, a protocol converter which receives an information signal to be transmitted and generates a control signal which is received by a modulator driver. Based thereon the modulator driver produces a modulating signal which causes a modulated light signal representing the information signal to be output. A laser bias control unit controls the output power level of the primary light signal based on a leak signal from the laser section.

Abstract: The present invention relates to an optoelectrical unit for converting information signals between an electrical signal format and an optical signal format. The proposed unit includes a circuit board, which contains at least one optoelectrical capsule. Each capsule is positioned on the circuit board, such that its footprint towards the circuit board has a smaller area than the area of a largest side of the capsule. Moreover, each capsule includes a feedthrough, which electrically connects one or more components therein to circuitry on the circuit board via a plurality of leads. The feedthrough also contains a shield which electrically shields at least one signal lead from at least one auxiliary lead. The feedthrough is adapted for positioning the optoelectrical capsule at an arbitrary adapted location on the circuit board.

Abstract: An optical sub-assembly is disclosed, having a mating end adapted to receive a mating fiber, and a back end provided with a converging lens establishing an expanded beam interface with an optical device. The use of an expanded beam interface provides greatly improved stability, and reduces the sensitivity to slight misalignments The optical sub-assembly comprises a receptacle for which the manufacturer thereof has full control over the optical interfaces and refractive index boundaries. The receptacle and the optical device may be manufactured separately.

Abstract: The present invention relates to optimization of communication equipment with respect to size and undesired signal interference. To this aim a ceramic feedthrough interconnection assembly is proposed in order to transport an electrical information signal to and from a communication capsule. In addition to at least one signal lead (103a, 103b) for communicating an electrical information signal, the assembly contains at least one auxiliary lead and a shield (103c, 103d, 104, 104a, 104b, 104f) that electrically shields the at least one signal lead (103a, 103b) from the at least one auxiliary lead. The shield (103c, 103d, 104, 104a, 104b, 104f) has such dimensions (d1, d2) and is positioned at such distance (d3, d4, d12) from the at least one signal lead (103a, 103b) that the electrical information signal experiences a well-defined and substantially constant impedance in the assembly. This in turn, minimizes the risk of undesired signal reflections. At the same time the assembly allows a high lead density, i.e.

Abstract: Embodiments of the present invention provide for ringing and inter-symbol interference reduction in optical communications. In one embodiment of the present invention, the rise time of the signal is longer than the fall time of the signal. The resulting asymmetrical driver pulse is sent to the laser. The resulting overshoot, ringing, undershoot and chirp of the output from the laser are greatly reduced. As a result, the eye is approximately symmetrical and is less closed.

Abstract: The invention relates to automatic phase adjustment in a phase locked loop including an oscillator (Os) with a controllable frequency. The oscillator generates a timing signal which is used together with a received data signal (1) to form two pulse trains (9,10) which comprise pulses of a duration which in the first pulse train (9) is independent of, and in the second pulse train (10) is responsive to, the phase position of the timing signal relative the phase position of the data signal. The pulse trains are utilized to form a control signal to the oscillator (Os). In forming the pulse trains (9,10) there is utilized a first array of signals (6-8) which are formed by the data signal (1) being sampled in several different phase positions with the aid of mutually phase shifted clock signals (2-4). A rapid locking-in of the phase locked loop is obtained in accordance with the following.

Abstract: An apparatus for increasing the dynamic range of an integrating input stage in an optoelectric receiver by means of a feed-back (F2) between the output of an amplifier (F1), associated with the stage, and the pole of an optoelectric converter (D) facing away from the input of the amplifier (F1). The gain of the feed-back can be controlled in response to the luminance with the aid of a transducer (G) connected in series with the converter (D).