2024年6月4日发(作者：风冰薇)
100 GbpsDP-QPSK
Applications
Backbone aggregation to replace N*10 G
LAG.
Data center network aggregation and
enterprise computing.
Convergence of Transport and Ethernet
at 100 G-Ethernet transport.
Overview
The combination of polarization-multiplexing and quadrature phase-
shift-keying (PM-QPSK or DP-QPSK) is emerging as one the most
promising solutions to reach bit ratesof 100 Gbpsand higher. At
the receiver end, the use of digital signal processing (DSP) results
in significant deployment improvement over the traditional
implementation. This application note shows a practical design of a
100 Gbps DP-QPSK transmission system using coherent detection
with digital signal processing for distortion compensation.
100 Gbps DP-QPSK Layout
Benefits
Significantly
development
reduces
costs and
product
boosts
Interfaces
design tools.
with popular
productivity through a comprehensive
design environment to help plan, test,
and simulate optical links in the
transmission layer of modern optical
networks.
Enables usersto analyze different
algorithms for the electronic equalization
(-Schmidt orthogonalization
procedure (GSOP), Ellipse correction
method (EC), transversal digital filter)
NewBER Test Set enables
the simulation of millions of
bits for direct error counting.
FEC
Multi-parameter scanning enables system designers to study
trade-offs with respect to parameters of interest andtochoose
an optimal design for deployments.
Exploresdifferent modulation formats for 100G: DQPSK,
coherent DP-QPSK, coherent OFDM, and coherent M-QAM.
Simulation Description
The 100 Gbps DP-QPSK system can be divided into five
main parts: DP-QPSK Transmitter, Transmission Link,
Coherent Receiver, Digital Signal Processing, and
Detection & Decoding (which is followed by direct-error-
counting). The signal is generated by an optical DP-
QPSK Transmitter, and is then propagated through the
fiber loop where dispersion and polarization effects
occur. It then passes through the Coherent Receiver and
into the DSP for distortion compensation. The fiber
dispersion is compensated using a simpletransversal
digital filter, and the adaptive polarization demultiplexing
is realized by applying the constant-modulus algorithm
(CMA). A modified Viterbi-and-Viterbi phase estimation
algorithm (working jointly on both polarizations) is then
used to compensate for phase and frequency mismatch
between the transmitter and local oscillator (LO). After
the digital signal processing is complete, the signal is
sent to the detector and decoder, and then to the BER
Test Set for direct-error-counting.
The electrical constellation diagrams (for polarization X)
before and after the DSP are as follows:
Below is an imageof the optical spectrum of the 100
Gbps DP-QPSK signal after the transmitter,as well as
the RF spectrum obtained after the Coherent DP-QPSK
Receiver.
The algorithms used for digital signal processing are
implemented through a Matlab component. By setting
the Matlab component to debug mode, the generated
electrical constellation diagrams after each step (CD
The inner structure of the DSP modules is shown below:
compensation, Polarization Demultiplexing, and Carrier
Phase Estimation) areshown here:
2024年6月4日发(作者：风冰薇)
100 GbpsDP-QPSK
Applications
Backbone aggregation to replace N*10 G
LAG.
Data center network aggregation and
enterprise computing.
Convergence of Transport and Ethernet
at 100 G-Ethernet transport.
Overview
The combination of polarization-multiplexing and quadrature phase-
shift-keying (PM-QPSK or DP-QPSK) is emerging as one the most
promising solutions to reach bit ratesof 100 Gbpsand higher. At
the receiver end, the use of digital signal processing (DSP) results
in significant deployment improvement over the traditional
implementation. This application note shows a practical design of a
100 Gbps DP-QPSK transmission system using coherent detection
with digital signal processing for distortion compensation.
100 Gbps DP-QPSK Layout
Benefits
Significantly
development
reduces
costs and
product
boosts
Interfaces
design tools.
with popular
productivity through a comprehensive
design environment to help plan, test,
and simulate optical links in the
transmission layer of modern optical
networks.
Enables usersto analyze different
algorithms for the electronic equalization
(-Schmidt orthogonalization
procedure (GSOP), Ellipse correction
method (EC), transversal digital filter)
NewBER Test Set enables
the simulation of millions of
bits for direct error counting.
FEC
Multi-parameter scanning enables system designers to study
trade-offs with respect to parameters of interest andtochoose
an optimal design for deployments.
Exploresdifferent modulation formats for 100G: DQPSK,
coherent DP-QPSK, coherent OFDM, and coherent M-QAM.
Simulation Description
The 100 Gbps DP-QPSK system can be divided into five
main parts: DP-QPSK Transmitter, Transmission Link,
Coherent Receiver, Digital Signal Processing, and
Detection & Decoding (which is followed by direct-error-
counting). The signal is generated by an optical DP-
QPSK Transmitter, and is then propagated through the
fiber loop where dispersion and polarization effects
occur. It then passes through the Coherent Receiver and
into the DSP for distortion compensation. The fiber
dispersion is compensated using a simpletransversal
digital filter, and the adaptive polarization demultiplexing
is realized by applying the constant-modulus algorithm
(CMA). A modified Viterbi-and-Viterbi phase estimation
algorithm (working jointly on both polarizations) is then
used to compensate for phase and frequency mismatch
between the transmitter and local oscillator (LO). After
the digital signal processing is complete, the signal is
sent to the detector and decoder, and then to the BER
Test Set for direct-error-counting.
The electrical constellation diagrams (for polarization X)
before and after the DSP are as follows:
Below is an imageof the optical spectrum of the 100
Gbps DP-QPSK signal after the transmitter,as well as
the RF spectrum obtained after the Coherent DP-QPSK
Receiver.
The algorithms used for digital signal processing are
implemented through a Matlab component. By setting
the Matlab component to debug mode, the generated
electrical constellation diagrams after each step (CD
The inner structure of the DSP modules is shown below:
compensation, Polarization Demultiplexing, and Carrier
Phase Estimation) areshown here: