Marconi Communications Gmbh

Tellabs Bedford, Inc.

Advanced Fibre Access Corporation

Bedford Tellabs, Inc.

Muneer Zuhdi

George H BuAbbud

George H Buabbud

Debra D Wawro

John W Matthes

Janet A Bradshaw

Ulrich Trick

Thomas Volk

Michael K Pratt

Georgeanne M Radloff

A method of transmitting bidirectional telephony communication signals on a single optical fiber. The bidirectional signals are transmitted in one direction as NRZ coded signals at a first clocking pulse rate, and in the other direction as Manchester coded signals at a second clocking pulse rate which is a multiple (preferably three times (3&#xd7;)) of the first clocking pulse rate.

Bidirectional frequency shift coding using two different codes for upstream and downstream

A single fiber passive optical network (PON) wavelength division multiplex (WDM) overlay includes a central office, a fiber optic network, and a plurality of optical network termination (ONT) units. The central office has a baseline optical link that receives a baseline communication signal and converts the baseline communication signal into a downstream baseline optical signal within a first optical bandwidth, and has an additional optical link that receives a second type of communication signal and converts the second type of communication signal into a second downstream optical signal within a second optical bandwidth. The downstream baseline optical signal generated by the baseline optical link is combined with the second optical signal generated by the additional optical link to generate a broadband optical signal. The fiber optic network is coupled to the central office and receives the broadband optical signal on at least one optic fiber. The fiber optic network splits the broadband optical signal to a plurality of fiber drops. The optical network termination (ONT) units are each coupled to a fiber drop. At least one of the ONT units is a baseline ONT unit that receives the broadband optical signal from the fiber drop and splits the downstream baseline optical signal from the broadband optical signal, and at least one other of the ONT units is an upgraded ONT unit that receives the broadband optical signal from the fiber drop and splits the downstream baseline optical signal and the second downstream optical signals from the broadband optical signal. In addition, the installation of the upgraded ONT unit to the PON does not effect baseline optical service to any other ONT unit.

Single fiber passive optical network wavelength division multiplex overlay

A method and apparatus for low cost upgrading on demand of an optical fiber communication system without installing additional optical fiber and minimal installation of optical circuitry at destination and distribution terminals. The upgraded systems comprise an optical data loop of a plurality of destination terminals and a single intermediate terminal.

Wavelength division multiplexed (WDM) ring passive optical network (PON) with route protection for replacement of splitter based passive optical networks

A method of transmitting and rapidly recovering a burst of data without first having to establish a timing or phase lock. The signals are transmitted as modified Manchester coded signals having pulse transitions at a clocking pulse rate which is a multiple of the clocking pulse rate at which the signals are originally generated, and wherein the MOOSE coded signal is modified by ON-OFF keying.

Bidirectional optical communications having quick data recovery without first establishing timing and phase lock

A method of transmitting bidirectional telephony communication signals on a single optical fiber. The bidirectional signals are transmitted in one direction as NRZ coded signals at a first clocking pulse rate, and in the other direction as modified a hybrid form of ON-OFF keying coded signals having pulse transitions at a second clocking pulse rate which is a multiple (preferably eight times (8&times;)) of the first clocking pulse rate, wherein the modified Manchester coded signal is modified by ON-OFF keying.

Bidirectional optical communications using on-off keying to generate a hybrid form of Manchester serial encoding for one of either upstream or downstream transmission

Apparatus and methods for maintaining balanced communication channels evenly even with heavy increases in service demands are disclosed. The apparatus uses an arrangement of jumpers and unique connection panes which allow rapid changes in the distribution of similar circuits to achieve balanced loads.

Apparatus and methods for maintaining balanced communication channels with increasing service demands

An apparatus for supporting a plurality of densely arranged electrically shielded communication panels includes a rack that supports at least two panels. The panels are supported adjacent to each other by the rack, and each panel includes at least two sides with a printed circuit on one side and a conductive sheet on the other side. In addition, the conductive sheet on each of the panels is coupled to an electrical connection point on the rack when the panel is placed in the rack. The two panels are placed in the rack such that the printed circuit of one of the panels is electrically shielded by the conductive sheet on another, closely aligned other one of the panels.

Densely arranged electrically shielded communication panels

Apparatus for combining an RF signal at one frequency band and carried by a selected nominal wavelength of light with a RF signal at a different and separate frequency band and carried by another source of light having the selected nominal wavelength onto a signal optical fiber.

Apparatus and method for combining two separate RF signals on a single optical fiber with monitoring and alarm capabilities

Apparatus and method for supporting a large number of densely arranged and electrically shielded panels are disclosed. To achieve shielding each panel has a grounded back plane which acts as shielding for circuitry on an adjacent panel as well as shielding for its own circuitry.

A light amplification system for amplifying a selected wavelength of light used for communicating information signals and having a microcontroller for substantially automatic start-up and shutdown and continuous monitoring of the critical parameters of the system.

Growing community of inventors

Lewisville, TX, United States of America

Muneer Zuhdi