InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links


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Achievements to this direction include:. Through the integration of all these components, POLYSYS has impressively achieved the final packaging of six out of the seven modules that had targeted:. New broadband applications continue to emerge, increasing the required bandwidth in every part of the network.

The amount of information that is exchanged today is creating real pressures in modern data-centers. The incorporation of thousands of servers has created the necessity to transfer massive amounts of data between racks, boards and modules quickly, efficiently and at low cost. Connectivity is thus a key factor, and it is today well understood that electrical cables and low cost commodity hardware cannot accommodate this explosion of required bandwidth.

The motivation behind its concept was to address the development of technical solutions for high-speed connectivity in data-center environments chip-to-chip interconnects and rack-to-rack interconnects and metro networks, but from a more general point of view, also to the development of the underlying technology for high-speed operation of optical and electronic components of optical transceivers in general. In order to address this challenge, POLYSYS invested on electro-optic EO polymer platform, not only as the basis for high-speed modulators but also as the basis for more complex photonic integrated circuits, on InP photonic platform as the basis for high-speed photo-detection, on InP-DHBT technology as the basis for high-speed electronics and on the development of a co-design methodology for the integration of these functionalities in small form factor arrayed modules.

The technical objectives of POLYSYS have been aimed through the use of hybrid integration for the assembly of the different components and the use of advanced packaging methodologies for the final packaging of the modules and systems. More specifically, the modules that have been targeted include:. The six modules are combined for developing three systems that address the following applications:. Work Package 2: System design and methodology for integration and packaging processes.

Activities in WP2 aimed at the exchange of technical information among partners, at defining the system-level specifications of POLYSYS components, at identifying the critical interfaces between individual components and confirming their compatibility, at generating the device models for system-level simulations of POLYSYS systems, at defining the methodology of the integration and packaging procedures and at performing preliminary evaluation of precursor units and test structures in order to refine the specifications of POLYSYS components.

During the course of the project, WP2 has offered a forum for defining the system specifications of POLYSYS components, devices and systems, for aligning the specifications of POLYSYS components and ensure their compatibility, for defining the integration methodologies taking into account the specific characteristics of the different integration platforms, and for making simulation studies regarding the system performance of POLYSYS devices and systems.

WP2 has also taken care of a smooth transition of all these activities into WP5 at the final stages of the project. WP3 focused on the design and the fabrication of the passive structures on the polymer platform bent waveguides, MMI couplers, Bragg-gratings , the fabrication of the modulators on the same electro-optic substrate, the development of the butt-coupling technique for the integration of the III-V elements to the polymer platform, and the final delivery of the optical transmitter subassemblies to WP5 for further device assembly.

WP3 has been particularly successful over the total duration of POLYSYS project: work in the framework of the specific workpackage developed the potential and confirmed the potential for monolithic integration of complex photonic structures such as MMI couplers and Bragg gratings together with MZM arrays on the EO polymer platform. It also confirmed the potential for hybrid integration of InP elements laser diodes, gain chips and waveguide-integrated pin photodiodes with the EO polymer platform using the butt-coupling technique, helping the EO polymer technology mature and evolve from a device specific technology into a general purpose integration platform for photonic integrated circuits PICs.

WP4 activities were devoted to the design and development of the InP photonic and electronic components. The system and method of the present invention determine clock signals from a multilevel signal that can be used in high speed communication applications. Exemplary uses of the present invention include electrical backplane, Ethernet, and optical applications. It should be understood that the foregoing relates only to illustrate the embodiments of the present invention, and that numerous changes may be made therein without departing from the scope and spirit of the invention as defined by the following claims.

Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A system for receiving a multi-level signal and determining a clock signal from the multi-level signal comprising: a variable threshold transition detector for differentiating a multilevel signal to form a signal that enables detection of edges of the multi-level signal, for sampling the signal at different points in time and applying an adaptive threshold to the differentiated signal to form a thresholded signal, and for generating a binary signal based on the thresholded signal;.

The system of claim 1 , wherein the variable threshold transition detector determines if a magnitude of a derivative based on the multilevel signal is greater than a predetermined threshold value. The system of claim 1 , wherein the variable threshold transition detector determines if a magnitude of a derivative based on the multilevel signal is less than a predetermined threshold value.

The system of claim 1 , wherein the variable threshold transition detector splits the multilevel signal into two signals, differentiates the two signals, thresholds the differentiated signals against two predetermined values, and combines the thresholded signals into one signal. The system of claim 4 , wherein the variable threshold transition detector combines the thresholded signals into one signal by using one of an exclusive-or XOR and logical-or OR operation between the two signals.

The system of claim 1 , wherein the variable threshold transition detector delays and splits the multilevel signal into at least two delayed signals, and differentiates and splits one of the delayed signals. USP true USB2 en.

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AUA1 en. WOA1 en. Solid state imaging apparatus, method for driving the same and camera using the same.


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High-speed analog-to-digital conversion with improved robustness to timing uncertainty. Adaptive noise filtering and equalization for optimal high speed multilevel signal decoding. Method and system for reducing radiated emissions from a communications channel. JPB2 en. GBA en. USA en. Optical communication system with pcm encoding with plural discrete unequally spaced intensity levels. Multiple-threshold optical receiver for a variable-rate digital data transmission system.

Telephony apparatus having filter capacitor switched to undergo discrete phase jumps. Converting and decoding receiver for digital data recorded in analog form on magnetic tape. Method for the coding of a digital signal, coder and decoder to implement this method, regeneration method and corresponding regenerator utilizing pulse position modulation.

Method and apparatus to compensate for distortion in optical transmission systems. Binary encoding method with substantially uniform rate of changing of the binary elements and corresponding method of incrementation and decrementation. Apparatus for linearization of optic modulators using a feed-forward predistortion circuit. System of very-long-distance digital transmission by optical fiber with compensation for distortions at reception. Optical communication link with correction of non-linear effects and optical signal processing method.

System for optically transmitting digital communications over an optical fiber with dispersion at the operating wavelength. Semiconductor light source with non-linear compensation means within a predistortion circuit. Signal path length correlator and method and an interference cancellation system using the same. Receive-side circuit for a system for optically transmitting a digital signal over a dispersive optical waveguide.

Method and apparatus for cancelling in-band energy leakage from transmitter to receiver. Quadrature amplitude modulator including a digital amplitude modulator as a component thereof. Postdistortion circuit for reducing distortion in an optical communications system. Adaptive equalizing apparatus for controlling the input signal level of quantized feedback. Apparatus, having a variable equalizer, for reproducing a digital signal from a record carrier.

Optical switching device with passive input and output stages and active amplifier in a matrix stage. Semiconductor diode laser having improved performance and method of manufacturing same. Structure generated composite reference signal for interference suppression in an adaptive loop.

Method and apparatus for making optical components by direct dispensing of curable liquid. Method and apparatus for generating data encoded pulses in return-to-zero format. Current source for reducing noise glitches generated in a digital to analog converter and method therefor. Automatic decision-point control type decision circuit and its control method. Method for generating duobinary signal and optical transmitter using the same method. Speech recognition apparatus equipped with means for removing erroneous candidate of speech recognition.

Posteriori probability calculation unit and a voice recognition device of a phoneme symbol. Level detector circuit, interface and method for interpreting and processing multi-level signals. Apparatus and method for producing analogically similar word based on pseudo-distances between words. Interference canceller for the protection of direct-sequence spread-spectrum communications from high-power narrowband interference.

RF front-end with signal cancellation using receiver signal to eliminate duplexer for a cordless phone. Communication device using the method and digital signal quality monitoring method. Optical transmitter, optical receiver and optical wavelength division multiplexing system. Borjak et al. Buchali et al. Cartledge et al. Chi et al. The whole document. Chiang et al. Choi et al. Cimini et al. Downie et al. WDD; Abstract. Enning et al. COM; No. Godin et al. Haskins et al. Hranilovic et al.

Idler et al. MTT-9, No.

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InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links
InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links
InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links
InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links
InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links InP DHBT-based Clock and Data Recovery Circuits for Ultra-High-Speed Optical Data Links

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