Error correction improvement for concatenated codes
Granted: December 5, 2006
Patent Number:
7146553
An enhanced forward error correction system is disclosed. Transmitted data is encoded into codewords in multiple dimensions. The decoding of received data by a decoder is performed in multiple passes in each dimension, with corrected data provided as an output from each pass into another decoder for the next decode pass. The encoder in one embodiment comprises a parallel inner RS(247,239) encoder or encoders and parallel outer BCH(255,247) encoder or encoders. Additional steps are added…
In-wafer testing of integrated optical components in photonic integrated circuits (PICs)
Granted: November 14, 2006
Patent Number:
7135382
Disclosed is a method of in-wafer testing of integrated optical components and in-wafer chips with photonic integrated circuits (PICs).
Method and apparatus of monitoring and controlling the emission wavelengths of a plurality of laser sources integrated on the same chip or in the same photonic integrated circuit (PIC)
Granted: November 14, 2006
Patent Number:
7136546
A method and apparatus operates an array of laser sources as an integrated array on a single substrate or as integrated in an optical transmitter photonic integrated circuit (TxPIC) maintaining the emission wavelengths of such integrated laser sources at their targeted emission wavelengths or at least to more approximate their desired respective emission wavelengths. Wavelength changing elements may accompany the laser sources to bring about the change in their operational or emission…
In-wafer testing of integrated optical components in photonic integrated circuits (PICs)
Granted: October 31, 2006
Patent Number:
7129100
Disclosed is a method of in-wafer testing of integrated optical components and in-wafer chips with photonic integrated circuits (PICs).
Optical communication module utilizing plural semiconductor transmitter photonic integrated circuit (TxPIC) chips
Granted: October 31, 2006
Patent Number:
7130499
An optical communication module comprises a plurality of monolithic semiconductor transmitter photonic integrated circuit (TxPIC) chips each having a plurality of optical signal channels approximating wavelengths on a standardized grid. Each of the channels comprises a laser source optically coupled to an electro-optic modulator. The outputs of the electro-optic modulators are coupled to inputs of an optical combiner integrated on each of the chips for combining the inputs to form a…
Oxygen-doped Al-containing current blocking layers in active semiconductor devices in photonic integrated circuits (PICs)
Granted: October 17, 2006
Patent Number:
7122846
In photonic integrated circuits (PICs) having at least one active semiconductor device, such as, a buried heterostructure semiconductor laser, LED, modulator, photodiode, heterojunction bipolar transistor, field effect transistor or other active device, a plurality of semiconductor layers are formed on a substrate with one of the layers being an active region. A current channel is formed through this active region defined by current blocking layers formed on adjacent sides of a…
Compact, cost-effective optical-electrical-optical (OEO) converter for an optical transmission network
Granted: October 17, 2006
Patent Number:
7123786
An optical-to-electrical-to-optical converter comprises a monolithic receiver photonic integrated circuit (RxPIC) InP-based chip comprising an optical waveguide formed in the chip from a chip input to receive a first multiplexed channel signal from an optical link and provide them to an arrayed waveguide grating (AWG) which demultiplexes the multiplexed channel signals and provides a plurality of electrical channel signals to an electronic regenerator. The regenerator regenerates the…
Optical signal receiver, an associated photonic integrated circuit (RxPIC), and method improving performance
Granted: October 3, 2006
Patent Number:
7116851
Photonic integrated circuits (PICs), also referred to as opto-electronic integrated circuits (OEICs), and more particularly to a PIC in the form of an optical receiver PIC or RxPIC chip and an optical transmitter PIC (TxPIC) are employed in an optical transport network. Integrated on the RxPIC chip, starting at the input end which is coupled to receive multiplexed optical data signals from an optical transport network is an optical amplifier, an optical demultiplexer, and a plurality of…
Method of monitoring and controlling the bit error rate (BER) in an optical communication network
Granted: October 3, 2006
Patent Number:
7116861
A method is disclosed for monitoring and controlling the bit error rate (BER) in an optical communication network where an optical receiver in the optical transmission network is a monolithic photonic integrated circuit (RxPIC) chip. The method includes the steps of decombining on-chip a combined channel signal received from the network and then monitoring a real time bit error rate (BER) of a decombined channel signal. The determined BER is then communicated, such as through an optical…
FEC enhanced system for an optical communication network
Granted: September 26, 2006
Patent Number:
7113667
A FEC enhanced system for an optical transport or communication network that includes an optical transmitter that has a transmitter photonic integrated circuit (TxPIC) chip having an integrated circuit comprising an array of modulated sources providing a plurality of optical modulated channel signals comprising digital bit data streams where each signal is at a wavelength on a wavelength grid. The modulated channel signal outputs from the modulated sources are provided to an integrated…
Method of adjusting a center wavelength of modulated sources wavelength grid with the passband of an optical combiner
Granted: September 19, 2006
Patent Number:
7110631
Disclosed is a method of adjusting a center channel wavelength of a group of channel wavelengths from of a plurality of modulated sources, integrated in a photonic integrated circuit (PIC), relative to the center of a wavelength passband of an optical combiner, such as an arrayed waveguide array (AWG), also integrated in the photonic integrated circuit (PIC) and optically coupled to outputs from the modulated sources.
Optical transmitter
Granted: September 5, 2006
Patent Number:
7103239
An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. A wavelength selective combiner is formed on the PIC chip having a wavelength grid passband response approximating the wavelength grid of the standardized wavelength grid. The signal…
Method of tuning integrated laser sources with integrated wavelength tuning elements on the same substrate or in a monolithic photonic integrated circuit (PIC)
Granted: August 15, 2006
Patent Number:
7092589
A method of operating an array of integrated laser sources formed as an integrated array on a single substrate in a photonic integrated circuit (PIC) where the laser sources are designed for operation at different targeted emission wavelengths which, in toto, at least approximate a grid of spatial emission wavelengths. A first wavelength tuning element is associated with each laser source and is adjusted over time so that each laser source maintains its targeted emission wavelength. As…
Oxygen-doped Al-containing current blocking layers in active semiconductor devices
Granted: August 8, 2006
Patent Number:
7087449
An active semiconductor device, such as, buried heterostructure semiconductor lasers, LEDs, modulators, photodiodes, heterojunction bipolar transistors, field effect transistors or other active devices, comprise a plurality of semiconductor layers formed on a substrate with one of the layers being an active region. A current channel is formed through this active region defined by current blocking layers formed on adjacent sides of a designated active region channel where the blocking…
Optical waveguide device with reduced insertion loss between optical waveguides coupled to a free space region
Granted: July 25, 2006
Patent Number:
7082231
An optical waveguide device, power coupler, a star coupler, a MMI coupler, an arrayed waveguide grating (AWG) or an Echelle grating, having at least one free space region with a plurality of optical waveguides coupled as inputs and separated by channels having a angled bottom portion, the channels monotonically decreasing in size or shape in a direction toward the free space region and optically coupling with adjacent waveguides at the interface region between the optical waveguides and…
Method of providing wider window margin in an eye diagram of a received signal in a transmission system
Granted: July 25, 2006
Patent Number:
7082253
A wider window margin in an eye diagram for an optical transmission signal is provided for both threshold and phase (timing).
Transmitter photonic integrated circuit (TxPIC) chip architectures and drive systems and wavelength stabilization for TxPICs
Granted: July 18, 2006
Patent Number:
7079715
A monolithic transmitter photonic integrated circuit (TxPIC) chip comprises an array of modulated sources formed on the PIC chip and having different operating wavelengths according to a standardized wavelength grid and providing signal outputs of different wavelengths. Pluralities of wavelength tuning elements are integrated on the chip, one associated with each of the modulated sources. An optical combiner is formed on the PIC chip and the signal outputs of the modulated sources are…
Optical probe and method of testing employing an interrogation beam or optical pickup
Granted: July 18, 2006
Patent Number:
7079718
An optical probe and a method for testing an optical chip or device, such as an photonic integrated circuit (PIC), to provide for testing of such devices or circuits while they are still in their in-wafer form and is accomplished by using a an optical probe for interrogation of the circuit where an access is provided in the wafer to one or more of such in-wafer devices or circuits. As one example, the interrogation may be an interrogation beam provided at the access input to the in-wafer…
Method of tuning optical components integrated on a monolithic chip
Granted: July 18, 2006
Patent Number:
7079719
A method of tuning optical components integrated on a monolithic chip, such as an optical transmitter photonic integrated circuit (TxPIC), is disclosed where a group of first optical components are each fabricated to have an operating wavelength approximating a wavelength on a standardized or predetermined wavelength grid and are each included with a local wavelength tuning component also integrated in the chip. Each of the first optical components is wavelength tuned through their local…
Method of operating an array of laser sources integrated in a monolithic chip or in a photonic integrated circuit (PIC)
Granted: July 18, 2006
Patent Number:
7079720
A method of operating an array of laser sources integrated as an array in a single monolithic chip where the steps include designing the laser sources to have different target emission wavelengths so that together they form a spectral emission wavelength grid, coupling outputs from the laser sources to an array of gain/loss elements also integrated on the single monolithic chip, one each receiving the output from a respective laser source; and adjusting the outputs with the gain/loss…
