Lucent Technologies Inc.

Shanghai Jiaotong University

Alcatel Lucent

Alcatel-lucent USA Inc.

Yikai Su

Xiang Liu

Xing Wei

Christopher Richard Doerr

Yan Li

Hui Li

Chongjin Xie

Randy Clinton Giles

Lothar Benedict Erhard Josef Moeller

Sethumadhavan Chandrasekhar

John Edward Simsarian

Lu Sun

Yu He

A compact silicon waveguide mode converter, a dielectric meta-surface structure based on periodical oblique subwavelength perturbations, including a top silicon structure with oblique subwavelength perturbations etched in certain periods with period length of &#x39b;, a duty cycle and an oblique angle &#x3b8; on the SOI substrate. The invention adopts an all-dielectric meta-surface structure with oblique subwavelength perturbation, which can achieve a compact mode conversion from fundamental mode to arbitrary high-order mode of silicon waveguide, and can improve the optical communication capacity greatly.

Ultra-compact silicon waveguide mode converter based on meta-surface structure

The present invention discloses a photo-alignment apparatus that realizes a desirable distribution through a single exposure and a method of manufacturing an optical element. The photo-alignment apparatus comprises a light source, a linear polarization film, a pixelated electronic-control phase retarder, and a phase retardation plate; the light source is used to provide light for a exposure; the linear polarization film is configured to convert the light emitted by the light source into a linearly-polarized light having a polarization direction parallel to the direction of the transmission axis of the linear polarization film; the pixelated electronic-control phase retarder is configured to generate phase retardations distributed in a desirable pattern; and the phase retardation plate is used to generate a non-pixelated phase retardation. With this photo-alignment apparatus, a polarization distribution of a desirable pattern can be generated, and a corresponding alignment profile can be formed on a polarization sensitive medium.

Photo-alignment apparatus that realizes desirable distribution through single exposure and method of manufacturing an optical element

An optical amplification method and apparatus implemented using RZ-DPSK modulation or variants thereof and a deeply saturated semiconductor optical amplifier.

Optical communication method and apparatus

A method and system for ultra-high bit rate fiber-optic communications (e.g., 160 Gb/s) utilize a phase-correlated modulation format where phases of bits in adjacent four-bit groups in transmitted optical pulse trains are altered by &#x3c0; (or 180&#xb0;).

Method and system for ultra-high bit rate fiber-optic communications

A system and method for transmitting optically labeled packets using DPSK/ASK modulation. The system comprises a transmitter including at least two modulators adapted to provide DPSK modulation of a payload portion of optically labeled packets and ASK modulation for a label portion of the optically labeled packets. A receiver is also provided which includes a balanced detector for detection of the payload portion of the optically labeled packets.

System and method for optically labeled packet transmission

A variable bandwidth hierarchical OADM apparatus and method handles different data rates, based on a waveband OADM and one or more wavelength OADMs in parallel. The wavelength OADM combines multiple adjacent channels with fine granularity up to the bandwidth of the waveband OADM. The wavebands and wavelengths to be passed, dropped, and added by the hierarchical OADM apparatus are all electronically selectable, hence no hardware modification is needed when the data rate is changed. The use of a coarse granularity waveband OADM and variable-bandwidth wavelength OADM with fine granularity enables our hierarchical OADM apparatus and method to provide a variable-bandwidth multi-granularity add/drop capability.

Variable-bandwidth multi-granularity optical add/drop network

A control circuit for a tunable laser has a logic circuit configured to generate a plurality of digital control signals using a table of calibration parameters stored in that circuit. The logic circuit receives an input signal specifying, e.g., an optical communication channel, retrieves the corresponding parameter values from the table of calibration parameters, and generates the digital control signals that are digital-to-analog converted, amplified, and applied to the tunable laser. The table of calibration parameters may be custom-generated for each particular tunable laser to accommodate laser-to-laser variations. In addition, the table of calibration parameters may be periodically updated to correct for wavelength drifting due to laser aging. A control circuit of the invention can be configured to update the table of calibration parameters in a non-disruptive continuous manner while the tunable laser controlled by the circuit is used for data transmission. Certain control circuits of the invention can support channel-to-channel switching times on the order of 50 ns.

Growing community of inventors

Shanghai, China

Yikai Su