Nils Anders Olsson, 725624 Brianna Ln, Bellvue, CO 80512

7925172, Apr 12, 2011

Jul 31, 2008

12/184137

Nils Anders Olsson - Bellvue CO, US
Daniel Mahgerefteh - Palo Alto CA, US

Finisar Corporation - Sunnyvale CA

H04B 10/04

398201, 398185, 398186, 398187, 398194

An optical transmitter is disclosed wherein a directly modulated laser outputs a frequency modulated signal through a semiconductor optical amplifier. Both the optical transmitter and semiconductor amplifier are modulated according to an output of a digital data source. An optical filter is positioned to receive an output of the semiconductor optical amplifier and has a frequency dependent transmission function effective to convert the amplified signal into a filtered signal having enhanced amplitude modulation. In some embodiments, the semiconductor optical amplifier is coupled to the digital data source by means of a compensation circuit configured to high-pass filter the output of the digital signal source. In other embodiments, the semiconductor optical amplifier is coupled to the digital data source by means of a compensation circuit configured to produce an output including a first-order time derivative of the output of the digital signal source.

4632552, Dec 30, 1986

Mar 6, 1985

6/708962

Nils A. Olsson - New Providence NJ
Yan-Chi Shi - Parsippany NJ

AT&T Bell Laboratories - Murray Hill NJ

G01B 902
H01S 313

356345

A laser-driven interferometric signal sensing system has a cleaved-coupled cavity laser with separate stabilization servo loops of different time constants for the modulator and laser sections thereof. The laser section is biased above lasing threshold, and its stabilization loop is operated at a frequency twice the frequency of laser section bias current modulation. A laser loop feedback error signal is a function of predetermined, environmental-type, parameter variations in the sensing location and is processed to be a function of the second derivative of interferometer output intensity with respect to laser section current. That error signal is applied to modify laser section bias current in a direction to zero out the feedback signal.

4914667, Apr 3, 1990

May 30, 1989

7/358468

Greg E. Blonder - Maplewood NJ
Charles H. Henry - Skillman NJ
Rudolf F. Kazarinov - Martinsville NJ
Nils A. Olsson - Summit NJ
Kenneth J. Orlowsky - Middlesex NJ

American Telephone and Telegraph Company, AT&T Bell Laboratories - Murray Hill NJ

H01S 319

372 44

In the interest of ease of manufacture, hybrid lasers of distributed-Bragg-reflector type are preferred for use as light sources in optical communications. Such lasers are made to operate away from mode instabilities by adjusting a laser parameter such as, e. g. , laser temperature, thereby assuring highly error-free transmission. Alternatively, by suitable design of the Bragg reflector it is possible to render mode instability of negligible influence on error rate.

4571576, Feb 18, 1986

Oct 31, 1983

6/546991

Nils A. Olsson - Summit NJ

AT&T Bell Laboratories - Murray Hill NJ

H03K 1302

340347AD

An analog-to-digital converter using a frequency tunable laser having output radiation of a frequency determined by the input voltage to the laser is described.

4564946, Jan 14, 1986

Feb 25, 1983

6/469800

Nils A. Olsson - Berkeley Heights NJ
Won-Tien Tsang - New Providence NJ

AT&T Bell Laboratories - Murray Hill NJ

H01S 319

372 20

Frequency shift keying optical communications devices using a cleaved coupled cavity laser are described. The cleaved coupled cavity laser comprises first and second laser diode sections which are mutually optically coupled to each other and means for adjusting the refractive index of the first and second sections relative to each other. The cleaved coupled cavity laser is part of a light source which further comprises means for selecting at least one desired output frequency from a group of at least two output frequencies.

4952017, Aug 28, 1990

Mar 14, 1989

7/323462

Charles H. Henry - Skillman NJ
Rudolf F. Kazarinov - Martinsville NJ
Nils A. Olsson - Gillette NJ

AT&T Bell Laboratories - Murray Hill NJ

G02B 626
H03F 304
H01S 3098
H01L 2966

350 9615

In a fiber-optic communication system, a polarization independent semiconductor optical amplifier structure is achieved by tailoring the height-width aspect ratio of its active region to a value at least close to unity and at the same time using a laser cavity structure in which the end mirrors are buried in the semiconductor body in which the optical amplifier structure is built.

4947134, Aug 7, 1990

Oct 30, 1987

7/115143

Nils A. Olsson - New Providence NJ

American Telephone and Telegraph Company - New York NY

H01L 1500
H01S 220

330 43

A single frequency lightwave system employs semiconductor, optical amplifiers arranged in tandem with suitable nose filtering and isolation between amplifier stages. Feedback control maintains overlap between the signal frequency and one of the passbands of the amplifiers. Either direct detection or coherent detection can be used. Also described is a receiver front end which includes such an amplifier between the incoming signal and a photodetector. Both transmission systems and switching systems are described.

4941738, Jul 17, 1990

Jul 29, 1988

7/225700

Nils A. Olsson - New Providence NJ

American Telephone and Telegraph Company - New York NY

G02B 530

350377

A polarization independent semiconductor amplifier is used in a double-pass configuration; that is, the output of the amplifier is passed through a 45. degree. Faraday rotator to a mirror and then through the rotator and the amplifier again. Polarization independent gain is thus achieved.