Optical transport network
Granted: March 30, 2006
Application Number:
20060067619
An optical transport network comprises a monolithic transmitter photonic integrated circuit (TxPIC) InP-based chip and a monolithic receiver photonic integrated circuit (RxPIC) InP-based chip.
Monolithic photonic integrated circuit (PIC) chip and a method tuning optical components integrated in a monolithic photonic integrated circuit (PIC)
Granted: March 23, 2006
Application Number:
20060062519
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…
Benzocyclobutene polymer (BCB) as a passivation layer for optical passive elements
Granted: February 9, 2006
Application Number:
20060029324
An InP-based photonic integrated circuit (PIC) includes an optical passive element in the circuit with no bias current applied to such an element. A passivation cladding layer overlies a surface of the optical passive element where the passivation layer comprises benzocyclobutene polymer or BCB.
Method of in-wafer testing of monolithic photonic integrated circuits (PICs) formed in a semiconductor wafer
Granted: February 2, 2006
Application Number:
20060023992
A method of in-wafer testing is provided for a monolithic photonic integrated circuit (PIC) formed in a semiconductor wafer where each such in-wafer circuit comprises two or more integrated electro-optic components, one of each in tandem forming a signal channel in the circuit. The method includes the provision of a first integrated photodetector at a rear end of each signal channel and a second integrated photodetector at forward end of each signal channel. Then, the testing is…
Pattern-dependent error counts for use in correcting operational parameters in an optical receiver
Granted: January 12, 2006
Application Number:
20060008279
An optical transmission network includes an optical transmitter photonic integrated circuit (TxPIC) chip, utilized in an optical transmitter and has a plurality of monolithic modulated sources integrated for multiple signal channels on the same semiconductor chip is provided with channel equalization at the optical receiver side of the network that permits one or more such integrated modulated sources in the TxPIC chip to be out of specification thereby increasing the chip yield and…
Universal digital framer architecture for transport of client signals of any client payload and format type
Granted: December 29, 2005
Application Number:
20050286521
Client signals to be transported in a transmission network, particularly an optical transmission network, may have different payload envelope rates and are digitally mapped on the client egress side into first transport frames (also referred to as iDTF frames, or intra-node or internal digital transport frames), at the client side for intra-transport within terminal network elements (NEs) and further digitally mapped into second transport frames (also referred to as DTFs or digital…
Optical transmitter
Granted: December 29, 2005
Application Number:
20050286909
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…
FEC enhanced system for an optical communication network
Granted: December 15, 2005
Application Number:
20050276613
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…
Coolerless photonic integrated circuits (PICs) for WDM transmission networks and PICs operable with a floating signal channel grid changing with temperature but with fixed channel spacing in the floating grid
Granted: November 10, 2005
Application Number:
20050249509
A coolerless photonic integrated circuit (PIC), such as a semiconductor electro-absorption modulator/laser (EML) or a coolerless optical transmitter photonic integrated circuit (TxPIC), may be operated over a wide temperature range at temperatures higher then room temperature without the need for ambient cooling or hermetic packaging. Since there is large scale integration of N optical transmission signal WDM channels on a TxPIC chip, a new DWDM system approach with novel sensing schemes…
Method of optimizing optical channel signal demultiplexing in a monolithic receiver photonic integrated circuit (RxPIC)
Granted: September 29, 2005
Application Number:
20050213883
A method is disclosed for optimizing optical channel signal demultiplexing in a monolithic receiver photonic integrated circuit (RXPIC) chip by providing an integrated channel signal demultiplexing with multiple waveguide input verniers provided to an WDM signal demultiplexer. The RxPIC chip may optionally include an integrated amplifier in at least some of the waveguide input verniers. The RxPIC chip may be comprised of, in monolithic form, a plurality of optional semiconductor optical…
Compact, cost-effective optical-electrical-optical (OEO) converter for an optical transmission network
Granted: September 22, 2005
Application Number:
20050207696
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 transport network
Granted: September 15, 2005
Application Number:
20050201669
An optical transport network comprises a monolithic transmitter photonic integrated circuit (TxPIC) InP-based chip and a monolithic receiver photonic integrated circuit (RxPIC) InP-based chip.
Optical communication module having at least one monolithic semiconductor photonic integrated circuit chip
Granted: August 4, 2005
Application Number:
20050169640
An optical communication module comprises at least one monolithic semiconductor transmitter photonic integrated circuit chip having a plurality of optical signal channels approximating wavelengths on a standardized grid. Each of said 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 integrated optical combiner for combining the inputs to form a combined signal output from the chip. A…
Oxygen-doped al-containing current blocking layers in active semiconductor devices in photonic integrated circuits (PICs)
Granted: July 14, 2005
Application Number:
20050151144
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…
Oxygen-doped al-containing current blocking layers in active semiconductor devices in photonic integrated circuits (PICs)
Granted: July 7, 2005
Application Number:
20050145863
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…
Method of monitoring and controlling the bit error rate (BER) in an optical communication network
Granted: June 23, 2005
Application Number:
20050135730
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…
Optical receiver photonic integrated circuit (RxPIC) system
Granted: June 23, 2005
Application Number:
20050135731
An optical receiver photonic integrated circuit (RxPIC) system includes a monolithic semiconductor chip having an input to receive a WDM combined channel signal comprising a plurality of optical channel signals of different wavelengths. A chip-integrated decombiner is coupled to the chip input to receive the WDM combined channel signal and separate the same into a plurality of different channel signals having different wavelengths. An array of integrated photodetectors, also integrated…
Method of providing wider window margin in an eye diagram of a received signal in a transmission system
Granted: June 23, 2005
Application Number:
20050135778
A wider window margin in an eye diagram for an optical transmission signal is provided for both threshold and phase (timing).
Optical transmission network with transmitter photonic integrated circuit (TxPIC) utilizing an optical service channel (OSC)
Granted: June 16, 2005
Application Number:
20050129350
An optical transmitter photonic integrated circuit (TxPIC) comprises a semiconductor monolithic chip with a plurality of optical signal channels where each channel comprises a modulated signal source. The output from the modulated signal sources are coupled to an input of an integrated optical combiner to form a WDM output signal for transmission off the TxPIC chip to an optical transmission link. An optical service channel (OSC) is also integrated on the TxPIC chip to receive a service…
Passivation of photonic integrated circuits (PICs)
Granted: June 2, 2005
Application Number:
20050117834
A photonic integrated circuit (PIC) comprises a plurality of integrated optically coupled components formed in a surface of the PIC and a passivating layer overlies at least a portion of the PIC surface. The overlying passivating layer comprises a material selected from the group consisting of BCB, ZnS and ZnSe. Also, when the circuits are PIC chips are die in the semiconductor wafer, a plurality of linear cleave streets are formed in a wafer passivation layer where a pattern of the…
