University of California

New Elite Technologies, Inc.

Other

Winston I Way

Gee-Kung Chang

Chiung-Hung Wang

Ming-Chia Wu

Wei-Hong Chen

An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the single-sideband modulated header and data payload propagate through network elements with the same path and the associated delays. The header routing information has sufficiently different characteristics from the data payload so that the signaling header can be detected without being affected by the data payload, and that the signaling header can also be removed without affecting the data payload. The signal routing technique can be overlaid onto the conventional network elements in a modular manner using two types of applique modules. The first type effects header encoding and decoding at the entry and exit points of the data payload into and out of the network; the second type effects header detection at each of~the network elements.

High-throughput, low-latency next generation internet networks using optical label switching and high-speed optical header generation, detection and reinsertion

As optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and the data payload propagate through network elements with the same path and the associated delays. The header routing information has sufficiently different characteristics from the data payload so that the signaling header can be detected without being affected by the data payload, and that the signaling header can also be removed without affecting the data payload. The signal routing technique can overlaid onto the conventional network elements in a modular manner using two types of applique modules. The first type effects header encoding and decoding at the entry and exit points of the data payload into and out of the network; the second type effects header detection at each of the network elements.

High-throughput low-latency next generation internet network using optical label switching and high-speed optical header generation detection and reinsertion

An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The header routing information has sufficiently different characteristics from the data payload so that the signaling header can be detected without being affected by the data payload, and that the signaling header can also be removed without affecting the data payload. The signal routing technique can overlaid onto the conventional network elements in a modular manner using two types of applique modules. The first type effects header encoding and decoding at the entry and exit points of the data payload into and out of the network; the second type effects header detection at each of the network elements.

An optical fiber transmitter, which consists of a modulated optical source, a pre-distortion circuit, a chirped-fiber grating, an optical circulator or a coupler, is designed to transport subcarrier multiplexed (SCM) signals over a long transmission distance. Here the SCM signals include: analog amplitude-modulated vestigial-sideband (AM-VSB) cable television signals, digital quadrature-amplitude-modulated (QAM) signals, or orthogonal-frequency-division-multiplexed (OFDM) signals, or quadrature-phase-shift-keyed (QPSK) signals, etc. on radio-frequency (RF) or microwave carriers, and/or digital wireless signals on RF, microwave or millimeter wave carriers. The modulated light source can be a directly modulated laser diode, or an external LiNbO3 modulator with a continuous wave (CW) laser diode as the source, or an external electro-absorption modulator with an integrated CW laser diode. The chirped fiber grating has a chromatic dispersion characteristic which is opposite to that of the output transmission path, so that the majority of nonlinear distortions and carrier suppression caused by the optical fiber dispersion in a long-distance system can be significantly reduced. The pre-distortion circuit is used to correct the residual nonlinear distortions and eliminate the residual carrier suppression effect, which cannot be completely eliminated by the chirped fiber grating. The pre-distortion circuit is also used to suppress the residual nonlinear distortions and carrier suppression effects caused by the chirped fiber grating itself.

Optical fiber transmitter for long distance subcarrier multiplexed lightwave systems

The invention provide an optical fiber transmitter by both suppressing stimulated Brillouin scattering (SBS) effect and composite second-order (CSO) distortions at an optimized condition. The optical fiber transmitter includes a frequency modulator generating a first tone microwave with frequency f coupled to a laser source, and a phase modulator generating a second tone microwave with frequency f coupled to an external phase modulator, so as to broaden the modulated light spectrum. The first tone microwave with frequency f is set to be greater than 2 to 3 times of the highest frequency content in the modulating signals. The second tone microwave with frequency f is designed to be close to a harmonic frequency of f and no less than three times of f . The first tone microwave with frequency f and a second frequency f are inputted to two power amplifiers, respectively, and then are respectively inputted to a laser source and an external phase modulator. These two power amplifiers are controlled by an microprocessor to automatically adjust a desired phase modulation index at 1.4 for the optical fiber transmitter with a repeaterless design or at an desired index depending on the desired transmission distance in a repeater design. The external phase modulator is coupled to a pare of fiber amplifiers for the repeaterless design or several pairs of fiber amplifers coupled in series for the repeater design. The last pair of the fiber amplifiers are coupled to optical receivers.

OPTICAL FIBER TRANSMITTER FOR SIMULTANEOUSLY SUPPRESSING STIMULATED BRILLOUIN SCATTERING AND SELF/EXTERNAL-PHASE MODULATION-INDUCED NOLINEAR DISTORTIONS IN A LONG-DISTANCE BROADBAND DISTRIBUTION SYSTEM

An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the single-sideband modulated header and data payload propagate through network elements with the same path and the associated delays. The header routing information has sufficiently different characteristics from the data payload so that the signaling header can be detected without being affected by the data payload, and that the signaling header can also be removed without affecting the data payload. The signal routing technique can be overlaid onto the conventional network elements in a modular manner using two types of applique modules. The first type effects header encoding and decoding at the entry and exit points of the data payload into and out of the network; the second type effects header detection at each of the network elements.

An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the single-sideband modulated header and data payload propagate through network elements with the same path and the associated delays. The header routing information has sufficiently different characteristics from the data payload so that the signaling header can be detected without being affected by the data payload, and that the signaling header can also be removed without affecting the data payload. The signal routing technique can overlaid onto the conventional network elements in a modular manner using two types of applique modules. The first type effects header encoding and decoding at the entry and exit points of the data payload into and out of the network; the second type effects header detection at each of the network elements.

A medium-access protocol is disclosed for use in a communication network to provide a two-way broadband communication network. The communication network comprises a central network controller (CNC) and a plurality of user nodes, and the protocol comprises the steps of: (a) providing an RF modulator and a receiver tuner for each of the user nodes; (b) allocating a plurality of vacant CATV channel for the CNC, each channel being assigned a separate frequency band; (c) causing a first user node, which intents to communicate with a second user node, to send a request-to-communicate signal to the CNC via a first frequency band centered at first frequency, the first user node having a first RF modulator and a first receiver tuner, and the second user node having a second RF modulator and a second receiver tuner; (d) causing the CNC to send a checking signal to the second user via a second frequency band centered at second frequency to see whether the second user is busy; (e) if the second user is not busy, then causing the CNC to assign a third frequency band centered at a third carrier frequency to the first RF modulator provided for the first user node and a fourth frequency band centered at a fourth carrier frequency to the second RF modulator provided for the first user node, and tuning the first receiver tuner to the fourth carrier frequency and tuning the second receiver tuner to the third carrier frequency; and (f) causing the first user node and the second user node to communicate via the third and fourth frequency bands. With this protocol, about 600 (analog) to 10,000 (digital) pairs of users can be allowed to communicate with each other at the same time. A security checking procedure can be provided by: (a) roll-call polling each user node to check a status thereof; and (b) warning a network manager if no response is received from any of the user nodes within a predetermined period of time.

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Hsinchu, Taiwan

Winston I Way