Fridolin L Bosch

6452254, Sep 17, 2002

Mar 15, 2001

09/808654

Fridolin Ludwig Bosch - Bethlehem PA
Hui Fu - Allentown PA
James Kevin Plourde - Allentown PA

Agere Systems Guardian Corp. - Orlando FL

H01L 2940

257664, 257690, 257692, 257693

An electronic package is adapted to be coupled in a single-ended configuration and in a differential configuration. The package provides a characteristic impedance of approximately 50 ohms when configured in a single-ended mode and also when configured in the differential mode. The package includes multiple terminals, which are coupled to ground, S, and {overscore (S)}. The package may be configured externally by the user for either mode. The package may also be fabricated to be coupled in either the differential mode or single-ended mode for user specific applications.

6618407, Sep 9, 2003

Aug 27, 1998

09/141143

George Edward Andrews - Fleetwood PA
Timothy P. Bock - Kutztown PA
Fridolin Ludwig Bosch - Bethlehem PA
Timothy Butrie - Orefield PA
Leo Anthony Procida - Alburtis PA
Stephen James Salko - Weatherly PA
Shaun P. Scrak - Souderton PA
Rao V. Yelamarty - Allentown PA

Triquint Technology Holding Co. - Hillsboro OR

H01S 5042

372 3802

An uncooled, through-hole configured laser module adapted to receive and transmit RF signals to a laser at bandwidths from direct current (DC) to about ten gigahertz. The laser module incorporates an option for two pin-out configurations. One pin-out configuration has one ground pin and one signal pin for operation at about one gigabit/second or one gigahertz. The second high performance pin-out uses two ground pins and one signal pin for operation up to about ten gigabit/second or ten gigahertz.

61305626, Oct 10, 2000

Aug 14, 1998

9/134364

Fridolin L. Bosch - Bethlehem PA
Gregory C. Salvador - Wernersville PA

Lucent Technologies, Inc. - Murray Hill NJ

H03B 100

327109

A digital driver circuit with increased maximum output voltage amplitude and therefore also increased maximum current amplitude for constant power supply voltages is provided. A current sensing resistor replaces the conventional current source transistor in the output stage of the driver circuit. In addition, the output current control circuit is applied to an earlier stage of the driver. An automatic output current control scheme is created which keeps the voltage across the current sensing resistor equal to a DC reference and therefore maintains the output current or voltage amplitude by actively level shifting the DATA and DATA drive signals for the output stage to the correct level. This eliminates the necessity to incorporate a voltage safety margin and simultaneously increases the maximum available output voltage amplitude. Therefore, by utilizing the current sensing resistor and by moving the output amplitude control circuit to an earlier stage of the driver circuit, the driver circuit of the present invention provides increased output voltage and current amplitudes to drive modulated devices.

54486297, Sep 5, 1995

Oct 14, 1993

8/136358

Fridolin L. Bosch - Bethlehem PA
Ton V. Nguyen - Bethlehem PA

AT&T Corp. - Murray Hill NJ

H04B 1004

359187

An amplitude control scheme for a high bit rate digital optical transmitter is disclosed. The data to be transmitted by the laser is pulse-width modulated by a low frequency signal. The pulse-width modulated signal is applied to the laser via a laser driver and to a mark density reference generator. The magnitude of the low frequency components from the mark density reference generator is a signal indicative of the desired amplitude of the laser light pulses. A back-face photodiode converts a portion of the laser light into an electrical signal, the magnitude of the low frequency portion thereof being a signal indicative of the actual amplitude of the laser light pulses. The actual amplitude of the laser light pulses is compared to the desired amplitude and the laser driver output amplitude may then adjusted to compensate for variations in the laser performance.

45396868, Sep 3, 1985

Oct 15, 1982

6/434583

Fridolin L. Bosch - Bethlehem PA
Clarence B. Swan - Allentown PA

AT&T Bell Laboratories - Murray Hill NJ

H01S 310

372 26

Disclosed is means for driving a laser whereby a dc bias current is supplied to keep the laser normally above threshold, and a modulation current brings the laser below threshold when a pulse appears. In one embodiment, a feedback controlled bias current source (11) and modulation current source (15) are coupled to the p-side terminal of the laser (10) while a constant voltage source (27) is coupled to the n-side terminal of the laser in a way which results in subtraction of the modulation current from the dc bias current. This mode of operation essentially eliminates laser overshoot and more nearly equalizes rise and fall times of the light pulses.

43172369, Feb 23, 1982

Feb 25, 1980

6/123953

Fridolin L. Bosch - Bethlehem PA
Gay L. Dybwad - Emmaus PA
Clarence B. Swan - Allentown PA

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H01S 318

455608

A system for improving performance of lasers in optical digital systems. This is accomplished by superimposing a microwave modulation current on the normal digital signal input. In the case of single mode lasers, this results in essential elimination of modal noise without any eye margin degradation. In the case of multimode lasers, the superimposed signal obviates various nonlinearities in the light output versus current characteristic which can cause eye margin degradation.

49224808, May 1, 1990

Dec 2, 1987

7/127843

Fridolin L. Bosch - Bethlehem PA

American Telephone and Telegraph Company - New York NY

H04B 900

370 3

A technique for increasing the number of manufactured laser transmitters which meet a predetermined wavelength specification is disclosed. Semiconductor lasers which exhibit a relationship between operating temperature and wavelength can be tuned by adjusting the operating temperature to ensure that the transmitter's operating wavelength will fall within the system-specified limits.

53733878, Dec 13, 1994

Oct 14, 1993

8/136503

Fridolin L. Bosch - Bethlehem PA
Ton V. Nguyen - Bethlehem PA

AT&T Corp. - Murray Hill NJ

H04B 1004

359187

An amplitude control scheme for a high bit rate digital optical transmitter is disclosed. The data to be transmitted by the laser is pulse-width modulated by a low frequency signal. The pulse-width modulated signal is applied to the laser via a laser driver and to a mark density reference generator. The magnitude of the low frequency components from the mark density reference generator is a signal indicative of the desired amplitude of the laser light pulses. A back-face photodiode converts a portion of the laser light into an electrical signal, the magnitude of the low frequency portion thereof being a signal indicative of the actual amplitude of the laser light pulses. The actual amplitude of the laser light pulses is computed to the desired amplitude and the laser driver output amplitude may then adjusted to compensate for variations in the laser performance.