| Patent Number |
Title Of Patent |
Date Issued |
| RE38359 |
Optical signal equalizer for wavelength division multiplexed optical fiber systems |
December 23, 2003 |
| This invention disclosure describes the application of a polarization insensitive acoustically-tuned optical filter used in a multichannel WDM system to equalize variations in the power level of the WDM channels. The invention also describes a simple means for providing a low frequency |
| 7346043 |
Allocation of channel capacity in multiservice networks |
March 18, 2008 |
| Methods are described which enable the operator of a network such as an Internet protocol (IP) network to allocate ingress and egress channel capacity for the use by different services or for use by different service providers. The methods can prevent a service provider or a service |
| 7239629 |
Multiservice network |
July 3, 2007 |
| A multiservice network for delivering enhanced communication services to customer devices attached to either the PSTN, such as telephones and fax machines, or devices attached to the Internet or private data networks, such as PCs or other IP devices, is presented. Enhanced services inclu |
| 6940849 |
System and method for IP telephony ping |
September 6, 2005 |
| The present invention provides a system and method for establishing the availability of a node to received a voice over internet protocol (VoIP) call. The present invention comprises attempting to establish a VoIP call to a given node that is the target of the VoIP call, determining whet |
| 6633572 |
Ethernet to ADSL adapter |
October 14, 2003 |
| An Ethernet ADSL adapter controls data communication between an Ethernet port and an ADSL modem connected to an ADSL channel. The adapter includes a first buffer for storing data packets received at the Ethernet port, a second buffer for storing data packets received from the ADSL modem |
| 6567854 |
Internet service delivery via server pushed personalized advertising dashboard |
May 20, 2003 |
| A communication service with a computer application is presented. The application provides an advertising dashboard to a subscriber engaged in a session of a service. The advertising dashboard includes an advertisement. The advertising dashboard may also include personalized information |
| 6493437 |
Advertising-subsidized PC-telephony |
December 10, 2002 |
| A system subsidizes telephone calls over a network. The system includes a service provider 120 that establishes a telephone call between a calling party terminal 130 and a called party terminal 140 over the network 110. During the telephone call, the service provider causes at least one |
| 6272550 |
Method and apparatus for acknowledging top data packets |
August 7, 2001 |
| A data communication network includes a network access unit for coupling one or more computer devices to the network. The network typically has asymmetric upstream and downstream data transmission rates. The network access device implements a method for acknowledging data packets. When a |
| 6208647 |
Multicast extension to data link layer protocols |
March 27, 2001 |
| A data link layer switch includes a switching mechanism coupled to several port interface controllers. The port interface controllers include an address table, an address learner, and an address matcher. The address table stores multicast addresses for hosts attached to the port interfac |
| 6061357 |
Ethernet to ADSL adapter |
May 9, 2000 |
| An Ethernet ADSL adapter controls data communication between an Ethernet port and an ADSL modem connected to an ADSL channel. The adapter includes a first buffer for storing data packets received at the Ethernet port, a second buffer for storing data packets received from the ADSL modem |
| 5961605 |
Method and apparatus for acknowledging TCP data packets |
October 5, 1999 |
| A data communication network includes a network access unit for coupling one or more computer devices to the network. The network typically has asymmetric upstream and downstream data transmission rates. The network access device implements a method for acknowledging data packets. When a |
| 5854699 |
Multiplexed subcarrier control in wavelength division multiplexed broadband networks |
December 29, 1998 |
| In a wavelength division multiplexed network having a plurality of nodes and having optical channels at wavelengths .lambda.i, where i=1 . . . N, for transmission of optical signals over optical interconnection means, control for informing the network of which nodes are transmitting at w |
| 5612806 |
Acknowledgement using subcarrier multiplexed tones |
March 18, 1997 |
| Subcarrier multiplexed acknowledgment tones are used for contention recovery in multiple-access WDM networks with basedband data packets and subcarrier multiplexed control headers. Upon receiving a data message from another node, the receiving node sends a subcarrier acknowledgement tone |
| 5546190 |
Carrier and clock recovery for lightwave systems |
August 13, 1996 |
| An optical communication system includes a transmitter for generating a subcarrier multiplexed optical signal from a pilot tone, a receiver and an optical fiber for coupling the optical signal from the transmitter to the receiver. At the transmitter, an optical carrier is modulated with |
| 5418785 |
Multiple-channel token ring network with single optical fiber utilizing subcarrier multiplexing |
May 23, 1995 |
| Apparatus for and method of communicating over a local area network is disclosed. Multiple nodes are connected by an optical fiber in a ring architecture. The cable supports multiple subcarrier multiplexed data communication channels for transmitting and receiving message data between |
| 5301058 |
Single sideband optical modulator for lightwave systems |
April 5, 1994 |
| Optical communication methods and apparatus are disclosed for transmitting two or more optical signals with different optical carrier frequencies on a single optical fiber with high spectral efficiency. Each optical carrier is typically modulated with multiple modulated subcarriers. In o |
| 5299057 |
Monolithically integrated optical amplifier and photodetector tap |
March 29, 1994 |
| A semiconductor optical amplifier with a high speed photodetector acting as an optical tap is disclosed. The device functions simultaneously as an in-line optical amplifier and as a high-speed photodetector tap. An in-line an optical amplifier is combined with a waveguiding, high speed |
| 5289480 |
Triple-function semiconductor laser amplifier |
February 22, 1994 |
| An optoelectronic device is disclosed utilizing a semiconductor laser amplifier that provides for simultaneous detection, amplification, and modulation of an input optical signal. In one embodiment, an electronic transmitter and receiver are coupled to the semiconductor laser amplifier |
| 5276543 |
Optical signal equalizer for wavelength division multiplexed optical fiber systems |
January 4, 1994 |
| This invention disclosure describes the application of a polarization insensitive acoustically-tuned optical filter used in a multichannel WDM system to equalize variations in the power level of the WDM channels. The invention also describes a simple means for providing a low frequency |
| 5253250 |
Routing and switching of high-speed optical data with the header transmitted on a subcarrier fre |
October 12, 1993 |
| A method and apparatus is disclosed for signaling a switch of the target destination of a data packet having a header specifying the destination address and an information frame. The data packet along with a separate instance of the header is subcarrier multiplexed and simultaneously |
| 5239401 |
Optical modulator for cancellation of second-order intermodulation products in lightwave systems |
August 24, 1993 |
| Optical communication methods and apparatus are disclosed for transmitting two or more optical signals with different optical carrier frequencies on a single optical fiber with high spectral efficiency. Each optical carrier is typically modulated with multiple modulated subcarriers. In o |
| 5194979 |
Wideband optical amplifier-receiver system |
March 16, 1993 |
| A semiconductor optical amplifier is utilized for optical amplification and for detection of an optical signal at the current injection electrode of the optical amplifier. A wide detection bandwidth is provided by utilizing an impedance transformer between the current injection terminal |
| 5185756 |
Wideband optical amplifier-receiver utilizing two electrode optical amplifier |
February 9, 1993 |
| A semiconductor optical amplifier is utilized for optical amplification and for detection of an optical signal at the current injection electrode of the optical amplifier. A wide detection bandwidth is provided by utilizing an impedance transformer between the current injection terminal |
| 5134509 |
Coherent subcarrier multiplexed optical communication system |
July 28, 1992 |
| An optical communication system includes a transmitter for generating a subcarrier multiplexed optical signal, a receiver and an optical fiber for coupling the optical signal from the transmitter to the receiver. At the transmitter, an optical carrier is modulated with a composite modula |
| 5119039 |
Semiconductor optical amplifier with wideband electrical response |
June 2, 1992 |
| A semiconductor optical amplifier includes an active region having facets at opposite ends thereof which define an optical cavity having maximum optical gain at a gain peak wavelength .lambda..sub.pk. An antireflection coating on each of the facets has a wavelength .lambda..sub.min of mi |
| 5101450 |
Quadrature optical phase modulators for lightwave systems |
March 31, 1992 |
| Optical communication methods and apparatus are disclosed for transmitting two or more optical signals with different optical carrier frequencies on a single optical fiber with high spectral efficiency. Each optical carrier is typically modulated with multiple modulated subcarriers. In o |
| 4989200 |
Coherent subcarrier multiplexed optical communication system |
January 29, 1991 |
| An optical communication system includes a transmitter for a generating a subcarrier multiplexed optical signal, a receiver and an optical fiber for coupling the optical signal from the transmitter to the receiver. At the transmitter, an optical carrier is modulated with a composite modu |
| 4953156 |
Wideband subcarrier multiplexed optical communication system operating over more than one octave |
August 28, 1990 |
| An optical communication system includes an optical transmitter for transmitting a subcarrier multiplexed optical signal through a single mode optical fiber to an optical receiver. The optical transmitter includes a semiconductor laser diode for generating a light beam. The laser diode i |
| 4941208 |
High performance subcarrier multiplexed optical communication system with modulation index excee |
July 10, 1990 |
| An optical communication system includes an optical transmitter for transmitting a subcarrier multiplexed optical signal through a single mode optical fiber to an optical receiver. The optical transmitter includes an optical source for generating a light beam. The optical source is p |
| 4766597 |
Single frequency semiconductor laser and drive with reduced linewidth and improved side mode sup |
August 23, 1988 |
| By driving a semiconductor laser with a current pulse having an optimized shape, the relaxation oscillations of the laser are greatly suppressed. This leads to significantly reduced frequency chirping and improved side mode suppression. The pulse broadening normally produced by 100 km of |
| 4689797 |
High power single spatial mode semiconductor laser |
August 25, 1987 |
| A high power single spatial mode semiconductor laser provides strong lateral index guiding to maintain single transverse mode output and yet has a large cavity area. The large cavity area provides low series resistance, low thermal resistance, and lower operating current densities an |
| 4679199 |
High power InGaAsP/InP semiconductor laser with low-doped active layer and very low series resis |
July 7, 1987 |
| In conventional InGaAsP/InP semiconductor lasers the p-doping in the InP laser level cannot be increased above 1.times.10.sup.18 atoms/cm.sup.3 without adversely affecting the optical characteristics of the devices. However, by introducing a thin low-doped p-InP layer and a thicker highl |
