Infinera Corporation

Lucent Technologies Inc.

Other

Agere Systems Optoelectronics Guardian Corp.

At+t Corp.

Triquint Technology Holding Co.

Triquent Technology Holding, Co.

Charles H Joyner

Fred A Kish, Jr

David F Welch

Radhakrishnan L Nagarajan

Mark Missey

Richard P Schneider

Alan C Nilsson

Robert B Taylor

Atul Mathur

Vincent G Dominic

Frank H Peters

Stephen G Grubb

Masaki Kato

Peter Weindel Evans

Matthew L Mitchell

Frank Peters

Jonas Webjorn

Christopher Richard Doerr

Mehrdad Ziari

Drew Daniel Perkins

Ting-Kuang Chiang

Martin Zirngibl

Scott W Corzine

Marco Sosa

Andrew G Dentai

Sheila K Hurtt

Edward Everett Sprague

Lawrence Warren Stulz

Sheila K Mathis

Uziel Koren

Prasad Paranjape

Abdallah Ougazzaden

Parthiban Kandappan

Leonard Jan-Peter Ketelsen

John Evan Johnson

Pavel Viktorovich Studenkov

Rene Henri Monnard

Damien Lambert

Matthew Fisher

Randal A Salvatore

Damien Jean Henri Lambert

Wei Chen

Brent Everett Little

Biao Lu

Nagesh R Basavanhally

Utpal Kumar Chakrabarti

Timothy Butrie

Sai T Chu

John V Hryniewicz

Juerg Leuthold

Michael Geva

Charles William Lentz

Si Hyung Cho

William Crossley Dautremont-Smith

Dirk Joachim Muehlner

Gleb E Shtengel

Michael Reffle

Ronald Eugene Leibenguth

Donald J Pavinski

Claude Lewis Reynolds, Jr

Gerard Edmond Henein

Sun-Yuan Huang

Fred A Kish

Sharon K Sputz

Jeff Rahn

Robert Grencavich

Chris W Ebert

Vinh D Nguyen

Donald J Pavinski, Jr

August Spannagel

Lothar Benedict Erhard Josef Moeller

Rudolph Conrad Schweizer

Thomas C Bitner

Janet L Lentz

Judith P Meester

Patrick C Chou

Jacco Leonard Pleumeekers

Jurg Leuthold

Vincent D Dominic

Mark J Missey

Marco E Sosa

Consistent with the present disclosure, both arms of an MZ interferometer are 'double-folded' and are bent in at least two locations to define first and second acute inner angles. Accordingly, the arms of the MZ interferometer may have substantially the same length, and, further, the MZ interferometer has a more compact geometry. In one example, the arms parallel each other and have a serpentine shape, and, in a further embodiment, the arms parallel one another and have a Z-shape. Accordingly, since the temperature of a PIC upon which the MZ interferometer is provided does not vary significantly over such short distances, the temperatures of both arms is substantially the same.

Mach-Zehnder interferometer having bended waveguides

A semiconductor monolithic transmitter photonic integrated circuit (TxPIC) comprises two different situations, either at least one signal channel in the PIC having a modulated source with the channel also extended to include at least one additional element or a plurality of modulated sources comprising N signal channels in the PIC of different transmission wavelengths, where N is equal to or greater than two (2), which may also approximate emission wavelengths along a standardized wavelength grid. In these two different situations, a common active region for such modulated sources and additional channel elements is identified as an extended identical active layer (EIAL), as it extends from a single modulated source to such additional channel elements in the same channel and/or extends to additional modulated sources in separate channels where the number of such channels is N equal to two or greater. The emission wavelength of laser sources in the modulated sources have different positively detuned offsets of the laser emission wavelength relative to the laser active region wavelength, i.e., (&#x3bb;&#x2212;&#x3bb;&#x3e;0), and their emission wavelengths form a wavelength grid which may substantially conform to a standardized wavelength grid, such as the ITU grid. These laser sources in the modulated sources with an EIAL are preferentially detuned in the range, for example, of about 20 nm to about 70 nm, preferentially from about 25 nm to about 50 nm, from the active region wavelength of the modulated sources.

Monolithic photonic integrated circuit (PIC) with a plurality of integrated arrays of laser sources and modulators employing an extended identical active layer (EIAL)

A laser source or a plurality of laser sources in a photonic integrated circuit (PIC) are provided with an electrical contact that is either segmented or is connected to a series of vernier resistor segments for supply of current to operate the laser source. In either case, at least one segment of the laser contact or at least one vernier resistor segment can be trimmed in order to vary the amount of current supplied to the laser source resulting in a change to its current density and, thus, a change in its operational wavelength while maintaining the current supplied to the laser source constant.

Apparatus and method for tuning a laser source emission wavelength employing a laser source contact comprising electrode segments

A method provides acceptable performance from a semiconductor transmitter photonic integrated circuit (TxPIC) that contains a plurality of modulated sources each comprising a laser source and an external modulator where each laser source provides a different emission wavelength and each modulated source forms a separate signal channel, comprising the steps of providing at least some of the signal channels with an extended identical active layer (EIAL) so that the modulated sources each have an identical active region wavelength and detuning the laser emission wavelength in each laser source within the EIAL from the laser active region wavelength.

Method of achieving acceptable performance in and fabrication of a monolithic photonic integrated circuit (PIC) with integrated arrays of laser sources and modulators employing an extended identical active layer (EIAL)

Consistent with the present disclosure, MZ drive signal electrodes may be provided relatively close to and parallel to one another, such that the underlying waveguide arms may also be provided close to and parallel to one another. As a result, common mode performance of an MZ modulator may be obtained. In one example, an electrode wiring configuration consistent with the present disclosure may permit a waveguide arm separation of 40 microns or less.

Mach-Zehnder having segmented drive signal electrodes

The present invention provides a system, apparatus and method to maintain the polarization state of an optical signal propagating within a photonic integrated circuit, or from a first photonic integrated circuit to a second photonic integrated circuit. According to various embodiments of the invention, an optical circuit is provided which includes an optical coupler configured to accept a first optical signal on a first input and a second optical signal on a second input, the second optical signal having a polarization state. The optical coupler may combine the first and second optical signals into an optical output signal. A principle axis of a first end of an optical fiber is may be configured to align with the polarization state of the second optical signal, such that a polarization maintaining connection is established. The polarization state may be a TM polarization state, a TE polarization state, or another polarization state. The optical circuit may include birefringent structures, such as birefringent waveguides and birefringent wavelength selective couplers, to further maintain the polarization of optical signals propagating through the photonic integrated circuits.

Polarization control in a photonic integrated circuit

Embodiments of the invention are described in which correlated virtual data streams are managed within an optical network connection. In certain embodiments of the invention, a client signal is allocated across a plurality of transport wavelength channels according to various transposition methods. The assignment of portions of the client signal to corresponding wavelengths may depend on various factors including channel utilization within the transport network and skew characteristics between particular wavelengths.

Maintaining correlated virtual data streams through a network

The present invention provides for a transceiver comprising a transmitter portion and a receiver portion. The transmitter portion includes a laser, the laser providing an optical signal having one of a plurality of wavelengths. The optical signal from the laser is modulated to create a first wavelength-division multiplexed signal at an output of the transceiver. The optical signal from the laser is also used by a demultiplexer to demultiplexer a second wavelength-division multiplexed signal at an input of the transceiver. The use of the optical signal from the laser in both modulation and demodulation of wavelength-division multiplexed signals results in a transceiver having fewer discrete components resulting in a compact design and reduced costs.

Transceiver photonic integrated circuit

According to this disclosure, embodiments of the present invention include photonic integrated circuits having active and passive geometric regions geometrically arranged to provide for more compact integrated photonic integrated circuits which, in turn, leads to higher chip yields and lower fabrication costs.

Compact photonic integrated circuit having geometrically arranged active and passive regions

Consistent with an aspect of the present disclosure, a package is provided that has a carrier and first and second substrates provided on the carrier. Conductive traces are provided on the first substrate (upper traces) and below it (lower traces) to provide two levels of electrical connectivity to a photonic integrated circuit (PIC) provided on the second substrate. As a result, an increased number of connections can be made to the PIC in a relatively small package, while maintaining adequate spacing and line widths for each trace. In addition, the lower traces are connected to bonding pads on the surface of the first substrate and are thus provided in the same plane as the upper traces. Testing of and access to both upper and lower traces is thus simplified.

Dual-level package

A photonic integrated circuit (PIC) chip comprising an array of modulated sources, each providing a modulated signal output at a channel wavelength different from the channel wavelength of other modulated sources and a wavelength selective combiner having an input optically coupled to received all the signal outputs from the modulated sources and provide a combined output signal on an output waveguide from the chip. The modulated sources, combiner and output waveguide are all integrated on the same chip.

Transmitter photonic integrated circuit (TxPIC) chip

The present invention provides a system, apparatus and method to provide for amplification at various points along one or more optical paths of a photonic integrated circuit. According to various embodiments of the invention, the photonic integrated circuit includes a plurality of optical devices having associated characteristics which may have lead to optical signal degradation. One or more optical amplifiers provided along one or more optical paths of the photonic integrated circuit compensate for such signal degradation, resulting in a highly configurable photonic integrated circuit. The various optical devices of the photonic integrated circuit may be provided on a single substrate.

Transmitter photonic integrated circuit

Consistent with the present disclosure, the number of passive waveguides in a PIC are reduced by directly connecting active components to one another. Accordingly, optical signals propagating in the PIC may experience less loss, and, thus, improved performance may be achieved. In addition, active components may be bent or curved in order to obtain a more compact layout with greater device density. Reduced manufacturing costs can therefore be realized.

Photonic integrated circuit having bent active components

A high capacity optical transmitter implemented on a photonic integrated circuit chip comprises a single light source which supplies a continuous wave having a particular wavelength to a plurality of modulators to form modulated optical information signals. A phase shifter is coupled to at least one of the modulators and is used to shift the phase of the corresponding modulated optical information signal associated with a particular modulator. A polarization beam combiner receives each of the modulated optical information signals from the modulators and the modulated optical information signal from the phase shifter and combines each of these signals to form a polarization multiplexed differential quadrature phase-shift keying signal. The light source, the plurality of modulators, the phase shifter and the polarization beam combiner are all integrated on the chip.

High capacity transmitter implemented on a photonic integrated circuit

A modulator is disclosed that includes three arms between a splitter portion and a coupler portion. The modulator typically requires at most a &#x3c0;/2 phase shift between constellation points. Accordingly, the modulator is more efficient and consumes less power.

Three-arm DQPSK modulator

Growing community of inventors

Sunnyvale, CA, United States of America

Charles H Joyner