Optical receiver photonic integrated circuit (RxPIC) system

• US 20050135731A1
• Filed: 01/10/2005
• Published: 06/23/2005
• Est. Priority Date: 10/09/2001
• Status: Active Grant

• Current Assignee: Infinera Corp.
• Original Assignee: Infinera Corp.
• Inventors: Chiang, Ting-Kuang, Welch, David F., Dominic, Vincent G.
• Granted Patent: US 7,050,666 B2
• Time in Patent Office: Days
• US Class Current: 385/14
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02B 6/12004 Combinations of two or more optical elements
• CPC Class Codes: G02B 6/12007 forming wavelength selective elements, e.g. multiplexer, demultiplexer
• CPC Class Codes: G02B 6/12011 characterised by the arrayed waveguides, e.g. comprising a filled groove in the array section
• CPC Class Codes: G02B 6/12019 characterised by the optical interconnection to or from the AWG devices, e.g. integration or coupling with lasers or photodiodes coupling integrated waveguide to fibre G02B6/30, to optoelectronic element G02B6/42; monolithic integration of integrated waveguides with other optical elements G02B6/12004
• CPC Class Codes: G02B 6/12023 characterised by means for reducing the polarisation dependence, e.g. reduced birefringence
• CPC Class Codes: G02B 6/12026 characterised by means for reducing the temperature dependence
• CPC Class Codes: G02B 6/12028 based on a combination of materials having a different refractive index temperature dependence, i.e. the materials are used for transmitting light
• CPC Class Codes: G02B 6/1203 using mounting means, e.g. by using a combination of materials having different thermal expansion coefficients
• CPC Class Codes: G02B 6/12033 characterised by means for configuring the device, e.g. moveable element for wavelength tuning switching G02B6/35; thermo-optic devices G02F1/0147
• CPC Class Codes: G02B 6/4249 comprising arrays of active devices and fibres
• CPC Class Codes: G02F 1/01725 Non-rectangular quantum well structures, e.g. graded or stepped quantum wells
• CPC Class Codes: G02F 1/0175 with a spatially varied well profile, e.g. graded or stepped quantum wells
• CPC Class Codes: G02F 1/01758 with an asymmetric well profile, e.g. asymmetrically stepped quantum wells
• CPC Class Codes: H01S 5/026 Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers stabilisation of output H01S5/06
• CPC Class Codes: H01S 5/0264 for monitoring the laser-output
• CPC Class Codes: H01S 5/0265 Intensity modulators intra-cavity modulators H01S5/0625
• CPC Class Codes: H01S 5/0268 Integrated waveguide grating router, e.g. emission of a multi-wavelength laser array is combined by a "dragon router"
• CPC Class Codes: H01S 5/04254 characterised by the shape
• CPC Class Codes: H01S 5/06256 with DBR-structure
• CPC Class Codes: H01S 5/06258 : with DFB-structure
• CPC Class Codes: H01S 5/0683 : by monitoring the optical output parameters
• CPC Class Codes: H01S 5/101 : Curved waveguide H01S5/1243 takes precedence
• CPC Class Codes: H01S 5/1014 : Tapered waveguide, e.g. spotsize converter H01S5/1064 takes precedence
• CPC Class Codes: H01S 5/12 : the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers comprising a photonic bandgap structure H01S5/11; surface-emitting lasers H01S5/18
• CPC Class Codes: H01S 5/1228 : DFB lasers with a complex coupled grating, e.g. gain or loss coupling
• CPC Class Codes: H01S 5/183 : having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
• CPC Class Codes: H01S 5/2077 : using lateral bandgap control during growth, e.g. selective growth, mask induced
• CPC Class Codes: H01S 5/22 : having a ridge or stripe structure
• CPC Class Codes: H01S 5/2224 : semi-insulating semiconductors
• CPC Class Codes: H01S 5/227 : Buried mesa structure ; Striped active layer
• CPC Class Codes: H01S 5/3404 : influencing the polarisation
• CPC Class Codes: H01S 5/3408 : characterised by specially shaped wells, e.g. triangular
• CPC Class Codes: H01S 5/34306 : emitting light at a wavelength longer than 1000nm, e.g. InP based 1300 and 1500nm lasers
• CPC Class Codes: H01S 5/4025 : Array arrangements, e.g. constituted by discrete laser diodes or laser bar H01S5/42 takes precedence
• CPC Class Codes: H01S 5/4031 : Edge-emitting structures
• CPC Class Codes: H01S 5/4087 : emitting more than one wavelength
• CPC Class Codes: H01S 5/50 : Amplifier structures not provided for in groups H01S5/02 - H01S5/30
• CPC Class Codes: H01S 5/5072 : Gain clamping, i.e. stabilisation by saturation using a further mode or frequency
• CPC Class Codes: H04B 10/25 : Arrangements specific to fibre transmission
• CPC Class Codes: H04B 10/2914 : using lumped semiconductor optical amplifiers [SOA]
• CPC Class Codes: H04B 10/50 : Transmitters
• CPC Class Codes: H04B 10/675 : for controlling the optical bandwidth of the input signal, e.g. spectral filtering
• CPC Class Codes: H04J 14/02 : Wavelength-division multiplex systems

Abstract

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 on the chip, each receive a separated channel signal and together provide a plurality of electrical signals representative of the optical channel signals. An electronic amplifier receives and amplifies the electrical signals. An electronic dispersion equalization (EDE) circuit is coupled to receive and adjust the amplified electrical signals for timing errors due to imperfect clock recovery of said electrical signals. An clock and data recover (CDR) circuit recovers a signal clock and data signals from the electrical signals.

Claims

1. An optical receiver photonic integrated circuit (RxPIC) system comprising:

a monolithic semiconductor chip having an input to receive a WDM combined channel signal comprising a plurality of optical channel signals of different wavelengths;

an integrated decombiner coupled to said input to receive said WDM combined channel signal and separate the same into said channel signals;

a plurality of outputs from said decombiner that each receives a separated channel signal;

an array of integrated photodetectors that each receive a separated channel signal and together provide a plurality of electrical signals representative of the optical channel signals;

an electronic amplifier to receive and amplify said electrical signals;

an electronic dispersion equalization (EDE) circuit coupled to receive and adjust said amplified electrical signals for timing errors due to imperfect clock recovery of said electrical signals; and

an clock and data recover (CDR) circuit to recover a signal clock and data signals from said electrical signals.

2. The optical receiver photonic integrated circuit (RxPIC) system of claim 2 further comprising a FEC decoder to receive said electrical signals and correct for error bits in said recovered data signals and provide bit error rates for each of said electrical signals;

and

a feedback circuit to said electronic dispersion equalization (EDE) circuit from said FEC decoder to provide feedback representative of timing errors in said recovered data signals.

3. The optical receiver photonic integrated circuit (RxPIC) system of claim 3 wherein said timing error feedback provides for adjustment of vertical threshold margin and horizontal phase margin of eye diagrams of the electrical signals in accordance with the method set forth in claim 36.