Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems

OCSim Modules

Modern Fiber Optic Communication Systems Simulations with Advanced Level Matlab Modules

.

Module 9a

.

Channel Multiplexing Techniques

.

Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems


Company Researchers & Developers

Integrate the Modules with your in-house and Commercial Software & Hardware Products

 

(1) Use the Existing Modules / Components for Your Research & Development.
(2) Modify the Modules / Components to the Next Level for Your Research & Development.
(3) Integrate Different Modules / Components in the OCSim Package to Realize Your Own Fiber Optic Communication Systems.
(4) Modify the Modules for Co-Simulations with the Third Party Commercial Optical Communication Systems Softwares.

 

Main Module

fiber_prop_wdm_dd.m

Simulation of linear and nonlinear fiber optic direct detection WDM systems.


This Module calls the following Sub Modules and Components:

(1) tx_nrz_ook.m
Modulates the optical carrier by OOK data.

(2) power_meter.m
Calculates the average optical power in dBm units.

(3) eye_diagram.m
Plots the eye diagram.

(4) fiber_prop.m
Propagation in optical fiber (takes into account fiber dispersion and loss).

(5) amp.m
Multiplies the input signal by gain factor and adds noise (the amount of noise is controlled by n_{sp}).

(6) opt_rect_filt.m
Optical ideal band pass filter to demultiplex the cental channel.

(7) gauss.m
An electrical (low pass) second order Gaussian filter.

(8) computeq_mzm.m
Calculates Q-factors.


Explore Further this Module:

9a.1 Change the channel spacing from 30 GHz to 200 GHz. Observe the WDM spectrum. Does the performance degrade as the channel spacing decreases? Explain.

Note: To have a reliable estimate of Q-factor, the number of bits should be really large. The average Q-factor obtained by running the code several times is more reliable than that obtained by a single run.

9a.2 Change the number of channels, N_{{c}} from 1 to 10. Keep the channel spacing at 50 GHz. Observe the WDM spectrum. Does the performance change when N_{{c}} increases beyond 3? Explain. Ignore nonlinear effects by setting the nonlinear coefficients close to zero.

9a.3 Change the number of transmission fiber spans from 10 to 30. Keep N_{{c}} = 5 and channel spacing = 50 GHz. Plot the Q-factor vs transmission distance. Make sure that Q-factor is obtained by averaging over multiple runs and it is converging.

9a.4 Design and simulate following WDM direct detection fiber optic system links:

28 Gb/s/channel, 50 GHz channel spacing, 8 channel, 20 span WDM fiber optic system link
10 Gb/s/channel, 25 GHz channel spacing, 16 channel, 40 span WDM fiber optic system link
40 Gb/s/channel, 100 GHz channel spacing, 8 channel, 20 span WDM fiber optic system link
– – –
– – –
n Gb/s/channel, m GHz channel spacing, M channel, N span WDM fiber optic system link
Choose the desired values of n, m, M and N for simulations.

Simulate more:

Switch on to Nonlinearity to design and simulate nonlinear WDM fiber optic system links.

 

.

Selected Simulated Results Using this Module 

.

.1-schematic-of-a-fiber-optic-wdm-system

 

Schematic of a Fiber Optic WDM System

 

Simulation Setup

 

2-time-diagram-of-the-central-channel-transmitter

.

Time Diagram of the Central Channel @ Transmitter

(Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems)

.

.

3-eye-diagram-of-the-central-channel-transmitter

…
.
Eye Diagram of the Central Channel @ Transmitter

(Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems)

.

.

4-spectrum-of-the-central-channel-transmitter

 

Spectrum of the Central Channel @ Transmitter

(Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems)

.

 

5-wdm-spectrum-transmitter

 

WDM Spectrum @ Transmitter

(Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems)

.

.

6-time-diagram-of-the-central-channel-receiver

 

Time Diagram of the Central Channel @ Receiver

(Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems)

.

 

8-eye-diagram-of-the-central-channel-receiver

 

Eye Diagram of the Central Channel @ Receiver

(Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems)

.

 

9-receiver-current-of-the-central-channel

 

Receiver Current of the Central Channel

(Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems)

.

 

10-eye-diagram-of-the-receiver-current-for-the-central-channel

 

Eye Diagram of the Receiver Current for the Central Channel

(Long Haul WDM Dispersion Managed Direct Detection Fiber Optic Communication Systems)

 

.

.

OCSim Modules details can be seen by clicking the pages below:

OCSim Modules Overview | OCSim Modules (1-18) in the Package

Module (1a) | Module (1b) | Module (1c) | Module (2a) | Module (2b) | Module (2c) | Module (3a) | Module (3b) | Module (4a) | Module (4b) | Module (4c) | Module (4d) | Module (5) | Module (6a) | Module (6b) | Module (7) | Module (8a) | Module (8b) | Module (8c) | Module (9a) | Module (9b) | Module (10) | Module (11a) | Module (11b) | Module (12) | Module (13) | Module (14) | Module (15) | Module (16) | Module (17) | Module (18)


OCSim Modules Brochure | OCSim Modules Selected Publication References | OCSim Modules Application Examples |

OCSim Modules Selected Simulated Results | OCSim Modules Videos       

.

Contact Us: Headquarter: Ottawa, Canada covering USA and Europe, Distributors: South America, Japan, India, Australia, China, South Korea.