Stephen J Mathis

US Patent:

7541959, Jun 2, 2009

Filed:

Mar 9, 2007

Appl. No.:

11/716532

Inventors:

Ronald F. Mathis - Murrieta CA, US
Stephen R. Mathis - Menifee CA, US
Paul N. Huntley - Poway CA, US

Assignee:

Photonics Products, Inc. - Murrieta CA

International Classification:

H03M 1/12

US Classification:

341155, 375245

Abstract:

A waveform acquisition system that captures and digitizes a wideband electrical signal through a bank of front end filters, frequency down converters, and conventional digitizers (A/D converters). A software algorithm reconstructs the composite input signal and applies the necessary corrections to remove the effects of hardware impairments. This approach is possible because it uses a class of filters that exhibit the quality of perfect waveform reconstruction, allowing signals whose spectral components overlap multiple filter bands, to be faithfully reconstructed. A calibration generator switched into the input port serves as a reference for quantifying and removing hardware errors. The channelized analog-to-digital converter (ADC) effectively multiplies the bandwidth and sampling rate of the conventional digitizer performance in a single channel by the number of channels in the system. The use of digital local oscillators enable a compact, low power, monolithic architecture.

US Patent:

20010033709, Oct 25, 2001

Filed:

Feb 28, 2001

Appl. No.:

09/796181

Inventors:

Stephen Mathis - Menifee CA, US

International Classification:

G02B006/28

US Classification:

385/024000, 385/015000

Abstract:

Devices for use in optical telecommunication networks are described which are capable of efficiently adding and dropping a plurality of channels, operating over a plurality of optical passbands, and being separated by a plurality of channel spacings. To accommodate the vast numbers of combinations and permutations of channel types and spacings, the network architecture includes both PINC and BEC devices in order to optimize power transfer through a network. In a preferred embodiment, a 1×16 multiplexer with equal channel passbands and spacing includes a 2-tier PINC network, followed by a 4-tier BEC network. However, in another embodiment, the 2-tier PINC network can be extended to 7-tiers to achieve 128 channels, with a channel spacing of 4 nm. In yet another embodiment, each of these 7-tiers can be followed by a single BEC. The selection of the quantity and order of PINC's and BEC's is determined by the quantity of channels desired, the passband of each channel, the separation between each channel, and the required isolation between channels.

US Patent:

20020067881, Jun 6, 2002

Filed:

Mar 6, 2001

Appl. No.:

09/799461

Inventors:

Stephen Mathis - Menifee CA, US

International Classification:

G02B006/28

US Classification:

385/024000

Abstract:

Devices for use in optical telecommunication networks are capable of efficiently adding or dropping any channel or selection of channels, accommodating the demand for dense wavelength division channel spacing, and providing a method for constructing an optical network composed entirely of optical fiber devices. The devices combine the best attributes of the fused biconic taper coupler WDM (which provides low loss) and the fiber optic Bragg grating (which provides superior channel resolution) to achieve low loss, high resolution channel spacing devices that are practical to manufacture. In one embodiment, there is provided a device for use in an optical telecommunication network, which comprises a first PINC-BEC having an input for receiving channels comprising wavelength bands , where n is a number greater than 2, and a plurality of outputs. This first PINC-BEC has a first Bragg grating for selectively isolating a desired one of the input channels from the remaining channels input into the PINC-BEC. The inventive system further comprises a second PINC-BEC having an input for receiving the remaining channels from an output of the first PINC-BEC and further filtering the desired one of the input channels from the input to the second PINC-BEC. Preferably, a Bragg grating is disposed between the first and second PINC-BECs to improve the isolation of the selected channel.