Components for Synchronous Optical Quadrature Phase Shift...

1synQPSK Univ. Paderborn, Germany; CeLight Israel; Photline, France; IPAG, Germany

synQPSKUniv. Paderborn, GermanyCeLight IsraelPhotline, FranceIPAG, Germany

Contract 004631 inFP6 IST-2002-2.3.2.2Optical, opto-electronic, & photonic functional components

Components for Synchronous Optical Quadrature Phase Shift Keying Transmission


Properties of synchronous optical QPSK (1)

Highest OSNR due to 18 photons/bit receiver sensitivity (excluding possible FEC gains), better than DQPSK, DPSK and any other schemeQuadrature phase shift keying: 2 bits / symbolWith added polarization division multiplex: 4 bits / symbol. Multiplies total fiber capacity by ~4 with respect to state-of-the art systems.Low symbol rate increases chromatic dispersion and PMD tolerances by factors of ~8 and 3, respectively, over those of standard intensity modulated systems.Evolutionary retrofitting of 40 Gbit/s transponders into existing 10 Gbit/s WDM systems


Properties of synchronous optical QPSK (2)

RZ symbol format makes the system nonlinearity-tolerant (XPM).Coherent optical receiver relaxes optical filtering requirementsElectrical received signals are proportional to optical fields

„Optical signal processing in the electrical domain“ becomes possible.Chromatic dispersion and polarization mode dispersion can be equalized electronically without any losses.


Project philosophy

Early single-polarization QPSK demonstrations used external cavity lasers, which can not be used in real systems. External cavity lasers are MUCH TOO EXPENSIVE.First (and only) report of synchronous PSK with (standard) DFB lasers:

ECOC 1992

synQPSK: Baseband (I&Q) processing, QPSK, polarization division multiplexConcept allows to use off-the-shelf DFB lasers (1...2 MHz linewidth).


Implementation plan

LiNbO3 optical QPSK modulatorsLiNbO3 optical 90° hybridsInP balanced integrated photoreceiversCo-packaging of 90° hybrid and InP photoreceiversPhase noise tolerant carrier recovery scheme

Digital implementation for 4×10 Gbit/s, for finest „optical signal processing in the electrical domain“SiGe and CMOS integrated electrical circuits

4×10 Gbit/s optical testbed with full functionality to be set up

synQPSK logo: Projection of 4-dimensional hypercube (2 quadratures, 2 polarizations)


System and testbed overviewSystem and testbed overview

Balancedphoto-

receivers

SiGe and CMOSintegrated

electrical circuits

Common package

DFB LO laser

WDM transmission

90° hybrids,polarization

diversity

QPSK and RZ modulators,polarization multiplex

DFB TX laser


WP1: QPSK modulator (Photline)

LiNbO3: Lowest lossMonolithic integration of 2 modulators on one chip Path length difference stabilizationFurther integration possibilities: 2 QPSK modulators, and splitters, for polarization division multiplex, RZ modulator

electrical input 1

λ/4 path length difference

optical input

optical output

electrical input 2


WP2: 90° hybrid and front end packaging (CeLight Israel)

Superposition of received and local oscillator optical fields with 0° and 90° phase shiftsI&Q baseband processingCo-packaging with IPAG‘s InP balanced photoreceivers

in phase

quadrature


WP3: Balanced photoreceivers (IPAG)

Low-noise differential photoreceiversSupport a lot of static photocurrent generated by LO powerPhotodiodes optimized for coupling with LiNbO3

in phase

quadrature


WP4: SiGe and CMOS integrated circuits (Univ. Paderborn)

VCO

PLL

4 x 10.7 Gbit/s(Demultiplexed to lower symbol rate)

2 BalancedPhotoreceivers y polarization

2 BalancedPhotoreceivers x polarization

SiGe Chip

ADCSiGe Chip

ADCSiGe Chip

ADCSiGe Chip

ADC

CMOS Chip

ElectronicPolarization Control

Phase-noise tolerantCarrier Recovery

Sampled, digitized and demultiplexed signals

IX QX QYIY


WP5: Testbed (Univ. Paderborn)

PBS

4 x 10.7 Gbit/s(Demultiplexed to lower symbol rate)

Automatic „electronic“ polarization control

BERT

TX laser

10.7 Gbit/s PPG

CLK Data

WDM transmission

MDR

MDR

RZ modulator PMC

MDR

QPSK modulator x

QPSK modulator y

LO laser

Balancedphoto-

receivers


electrical circuits


diversity

Front ends


Management structure

PhotlineIPAG

CILUPb

Organisation, Evaluation,Dissemination

Project Coordination(R. Noé, UPb)

H. PortePhotline (WP1)

R. BertenburgIPAG (WP3)

Y. AchiamCIL (WP2)

U. RückertUPb (WP4)

R. NoéUPb (WP5)

Technical Progress

Project Coordination Committee


Univ. Paderborn, Germany: Optical Communication and High-Frequency Engineering

Founded 1992, headed by Reinhold Noé →Presently 13 group membersRecent achievements

PMD compensation at 10 and 40 Gbit/sLow-cost online chromatic dispersion measurement at 40 Gbit/s by arrival time detection with a sensitivity of 100 attoseconds

10 and 40 Gbit/s transmission setups110 GHz Network analyzer, 50 GHz oscilloscope, 40 GHz spectrum analyzers, ...CAD design facility


Univ. Paderborn, Germany: System and Circuits Technology

Founded 1995, headed by Ulrich Rückert

Presently 25 group members

Focus: Systematic design and appropriate use of innovative microelectronic systems

Resource efficiency High speed CMOSMassively parallel systems

CAD design and test facility

Rapid prototyping based on the group's RAPTOR2000 system

ASIC prototyping in cooperation with the industryparticipating in the Europractice initiative


CeLight Israel

Fabrication facilities:Clean roomsLithium Niobate fabricationOptical measurementOptical characterizationPackaging Environmental testing


Photline, France

The productThe productPhotline family of components are designed to enable systems and modules manufacturers to meet the new challenges of the telecom market at 10 & 40 Gbit/s

Created end of 2000, Photline has brought to production a family of LiNbO3 modulators in less than 18 months.

Optical Eye diagram at 40Gb/s


Photline, France

Technological FacilitiesTechnological Facilities

Photline works in an environment of clean rooms for technological development, and is equipped with all the required laboratories for assembly and testing.


(Darmstadt/Duisburg, Germany)

Products:FP Laser PIN photodetectorsDFB Laser Integrated ReceiversSLEDsEpi-Wafer Material

IPAG fabricates bare die components and modules forapplications in telecommunications, medical,defense and sensing

IPAG - Innovative Processing AG

- 1310 - 1550 nm wavelength- DML up to 10Gbit/s- PINs up to 80GHz- PINs: 125°C operating temp.- monolithic integration with low-noise electronics

Copyright © 2004, IPAG - Innovative Processing AG. All rights reserved.


IPAG - Innovative Processing AG

Design: simulation tools Epitaxy: 2 x MOVPE DFB grating, sub-micron HEMTs: electron beam lithographyFront-end: processing line for FP/DFB laser and PIN chipsBack-end: facet coating, dicing, 100% automated testingReliability: lifetime testing (Telcordia and MIL compliant)

Manufacturing Capability

IPAG - Innovative Processing AGLotharstr. 55D-47057 DuisburgGermanywww.ipag35.com

Copyright © 2004, IPAG - Innovative Processing AG. All rights reserved.

20synQPSK Univ. Paderborn, Germany; CeLight Israel; Photline, France; IPAG, GermanyComponents for synchronous optical quadrature phase shift keying transmission

synQPSKUniv. Paderborn, GermanyCeLight IsraelPhotline, FranceIPAG, Germany

Balancedphoto-

receivers


electrical circuits

Common package

DFB LO laser

WDM transmission


diversity

QPSK and RZ modulators,polarization multiplex

DFB TX laser

Components for Synchronous Optical Quadrature Phase Shift...

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