| Patent Number |
Title Of Patent |
Date Issued |
| 5229876 |
Telemetry for optical fiber amplifier repeater |
July 20, 1993 |
| In this invention telemetry information is transmitted in an optical fiber communication system by providing an amplifier pump with excess power beyond that necessary to pump the amplifier. The excess power is not used to pump the amplifier but is rather used to transmit the telemetry |
| 5003546 |
Interferometric devices for reducing harmonic distortions in laser communication systems |
March 26, 1991 |
| In an optical communication system, in order to reduce simultaneously both second and third harmonic distortion in a light beam from a modulated semiconductor laser, a nonlinear interferometric deivce--such as a Fabry-Perot etalon--is inserted in the path of the beam. The parameters of |
| 4979234 |
Saturated semiconductor laser amplifier for compensation of optical fibre dispersion |
December 18, 1990 |
| The span of an optical dispersion-limited fiber for propagating optical pulses is improved by simultaneously chirping and amplifying the stream by means of a saturated semiconductor laser amplifier. The chirp causes a compression of the pulses as they propagate through an initial portion |
| 4952017 |
Polarization independent semiconductor optical amplifier |
August 28, 1990 |
| 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 |
| 4947134 |
Lightwave systems using optical amplifiers |
August 7, 1990 |
| 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 |
| 4941738 |
Polarization independent optical amplifier apparatus |
July 17, 1990 |
| 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. |
| 4914667 |
Hybrid laser for optical communications, and transmitter, system, and method |
April 3, 1990 |
| 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, th |
| 4900917 |
Polarization insensitive optical communication device utilizing optical preamplification |
February 13, 1990 |
| A polarization insensitive optical device is disclosed which is capable of providing direct optical amplification of an input signal of unknown (and possibly varying) polarization. A polarization diversity technique is utilized wherein a polarization beam splitter is used to divide the |
| 4852960 |
Narrow-linewidth resonant optical device, transmitter, system, and method |
August 1, 1989 |
| Highly frequency-selective reflectivity is realized in an optical device including a waveguide and an evanescent-field coupled grating resonator cavity. The device may include a light source and serve as a low-chirp, narrow-linewidth communications laser for use, e.g., for transmission o |
| 4785454 |
Stabilized cleaved-coupled cavity laser |
November 15, 1988 |
| A light transmitter comprising a cleaved-coupled cavity laser and stabilization means to maintain the laser in single longitudinal mode operation is described. ' |
| 4632552 |
Cleaved-coupled-cavity-laser-driven system for measuring small signals |
December 30, 1986 |
| 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 oper |
| 4571576 |
High speed analog-to-digital converter |
February 18, 1986 |
| 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 |
Optical communications system using frequency shift keying |
January 14, 1986 |
| 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 o |
| 4485473 |
Mode locking of travelling wave ring laser by amplitude modulation |
November 27, 1984 |
| An amplitude modulator for a tunable ring cavity dye laser is disclosed. The modulator is operated in time synchronization with the laser pump and is located assymetrically within the ring to attenuate dye laser pulses in one direction while passing pulses in the opposite direction, ther |
