Simulative investigation of transmission performance for proposed NG PON 2 based on DPQSK modulated downstream

with two diferent intensity modulated upstreams

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SIMULATIVE INVESTIGATION OF TRANSMISSION PERFORMANCE FOR

PROPOSED NG-PON 2 BASED ON DPQSK MODULATED DOWNSTREAM WITH

TWO DIFFERENT INTENSITY MODULATED UPSTREAMS

Areez Khalil Memon

FEST, Indus University, Karachi, (Pakistan)

E-mail: areez.memon@indus.edu.pk

Ahmed Muddassir Khan

FEST, Indus University, Karachi, (Pakistan)

E-mail: ahmed.muddassir@indus.edu.pk

Syed Hyder Abbas Musavi

FEST, Indus University, Karachi, (Pakistan)

E-mail: Dean@indus.edu.pk

Faizan ur Rehman

FEST, Indus University, Karachi, (Pakistan)

E-mail: faizan.rehman@indus.edu.pk

Atif Mehmood

FEST, Indus University, Karachi, (Pakistan)

E-mail: atifmehmood@indus.edu.pk

Sajid Hussain

FEST, Indus University, Karachi, (Pakistan)

E-mail: sajidhussain@indus.edu.pk

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ABSTRACT

We present a comparison between the two high data rate next generation passive optical

network (NG-PON 2) which are feasible to fulfill the future demand for bandwidth

hungry applications that exceeds beyond 10Gbps. This paper summarizes the best

suitable network for future bandwidth hungry applications by simulating both networks

through optisys simulated software considering standard values and recommendations

for NG-PON 2. Both networks support 40Gbps with Differential Quadrature Phase Shift

Keying (DQPSK) while at upstream one network supports 10Gbps with On Off Keying

(OOK) and other support Inverted return to zero (IRZ) with 10Km fiber span.

Comparison of both networks transmission performance in terms of BER with Rx power

and OSNR has been investigated and results shows that NG-PON 2 support 40Gbps with

DQPSK and 10Gbps IRZ is quite better than other network with higher sensitivity and

OSNR.

KEYWORDS

Differential Quadrature Phase Shift Keying (DQPSK), ON-OFF Keying (OOK), Inverted

Return to Zero (IRZ), Next Generation Passive Optical Network-2 (NGPON-2), Bit Error

Rate (BER), Optical Signal to Noise Ratio (OSNR).

1. INTRODUCTION

Evolution in PON is essential to deal with future bandwidth hungry applications. Existing

PON have a capability to transmit 10Gbps and 1Gpbs downstream and upstream data

rate with HDTV, multimedia and video calling simultaneously [1-2]. As per the survey

of CISCO in 2016 it is predicted that data rate will be increased twice compare to 2015

data rate [3]. It is necessary to increase the data rate capability up to 40Gpbs in PON to

deal with future bandwidth hungry applications and named as NG-PON 2 [4-6].

For higher data rate in PON, different modulation formats have been investigated and

analyzed in order to have less nonlinearities and dispersion effects [7]. Different

modulation formats have been implemented in 10Gbps data rate such as NRZ, RZ, MD-

RZ [8], CSRZ, MDRZ, DPSK [9], RZ-DQPSK with OOK [10], Differential Phase Shift

Keying (DPSK) with OOK [11], Carrier suppressed return to zero CSRZ-DQPSK with

OOK [10-12], NRZ-DQPSK with ASK [13,14], DPSK with IRZ [15,16]. For high data

rate, few modulation techniques have been proposed and analyzed such as DQPSK with

IRZ [17] and DQPSK with OOK [18].

In this paper we have analyzed the performance of two high data rate NG-PON 2 having

the same downstream modulation DQPSK but different upstream modulation OOK and

IRZ. DQPSK modulation format is used as it has high spectrum efficiency and high

transmission impairments [19] and OOK and IRZ modulation formats used as they are

simple and cost effective design [20,21]. Both DQPSK with OOK and DQPSK with IRZ

architectures have 40Gbps data rate in downstream and 10Gpbs data rate in upstream

with 10km fiber span by using FBG dispersion compensation.

2. DESCRIPTION OF SIMULATION

For analyzing the performance of both architectures, simulation software has been used

named as Optisystem [22]. Figure 1 and Figure 2 shows the simulated model of high data

rate DQPSK with OOK and high data rate DQPSK with IRZ NG-PON 2 having same

parameters except different modulation technique in upstream. Both networks have

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OLT, ONU and optical fiber length of 10Km with FBG dispersion compensator. CW

LASER at 0dBm launch power is used as a carrier source which is modulated with

electrical data stream generated from pseudo random generator (PRBS) having data rate

40Gbps through two series connected Lithium Niobate Mach-Zehnder modulator (LiNb

MZM). Modulated signal is transmitted through optical fiber span of 10km with

0.2dB/km attenuation co-efficient as shown in Table 1.

Figure 1. 40Gbps DQPSK with OOK Next Generation Passive Optical Network (NG-PON).

Figure 2. 40Gbps DQPSK with IRZ Next Generation Passive Optical Network (NG-PON) with FBG.

Transmitter

Receiver

Transmitt

CW LASER

Frequency

193.THz

Power 0dBm

DQPSK

Modulato

Data Rate

40Gbps

10Km Fiber +

FBG

Dispersion

Compensati

DQPSK

Receiver

OOK

Modulato

Data Rate

10Gbps

10Km Fiber +

FBG

Dispersion

Compensati

OOK Receiver

Transmitter

Receiver

Transmitt

CW LASER

Frequency

193.THz

Power 0dBm

DQPSK

Modulato

Data Rate

40Gbps

10Km Fiber

+ FBG

Dispersion

Compensati

DQPSK

Receiver

IRZ

Modulato

Data Rate

10Gbps

10Km Fiber

+ FBG

Dispersion

Compensati

IRZ Receiver

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Table 1. Simulated Model Parameters for both Networks.

Parameter

Values

Transmission Section

Power of Laser

0dBm

Frequency of Laser

193.1 THz

Fiber

Fiber Length

10Km

Dispersion slop

0.075 ps/nm

/km

Effective core area

80 um

Non Linear index-coefficient

2.6x10

-20

Attenuation Coeff:

0.2 dB/km

Dispersion

16.75 ps/nm/km

Receiver Section

Filter Cutoff Frequency

0.75*bit rate Hz

DQPSK modulation technique is used in the downstream of both networks. DQPSK

transmitter modulator is shown in Figure 3. DQPSK transmitter is composed of CW

Laser having 0dBm power (1mW) works at 1550nm and data is generated from psuedo-

random bit squence (PRBS) generator of 40Gbps. Data is modulated after differential

precoding through two LiNb Mach-Zehnder Modulators. One modulator is act as a

phase modulator to create a dephasing of π/2.

Figure 3. DQPSK Transmitter.

After modulation, signal is transmitted through optical fiber towards the reciever of the

ONU where signal is splitted into two signals demodulated through coupler and followed

by two photodetector PIN. There output combines with the subtractor and gives the

electrical output as shown in Figure 4.

Figure 4. DQPSK Receiver for Inphase and Quadrature phase Signal.

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The ONU transmitter remodulates the signal through OOK modulation in one network

while IRZ in another network. For OOK transmitter, same signal is modulated through

Mach-Zehnder modulator with data generator from psuedo-random bit squence (PRBS)

generator of 10Gbps shown in Figure 5.

Figure 5. OOK Transmitter.

Modulated signal transmitted through optical fiber received by photodetector which

demodulates the signal gives electrical output as shown in Figure 6.

Figure 6. OOK Receiver.

Whereas IRZ transmitter for second network, same signal is modulated through Mach-

Zehnder modulator with data generator from psuedo-random bit squence (PRBS)

generator of 10Gbps which added with pulse generator having frequency 5GHz and

phase of –π/4 shown in Figure 7.

Figure 7. IRZ Transmitter.

Modulated signal transmitted through optical fiber received by photodetector which

demodulates the signal gives electrical output shown in Figure 8.

Figure 8. IRZ Receiver.

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3. DISCUSSION OF RESULTS

Figure 9,10,11 and 12 shows the optical spectrum of downstream and upstream of both

DQPSK with OOK and DQPSK with IRZ at a carrier frequency of 193.1THz (1550mm

Wavelength).

Figure 9. Optical Spectruem of Downstream DQPSK with OOK.

Figure 10. Optical Spectrum of upstream OOK.

Figure 11. Optical Spectrum of Downstream DQPSK/IRZ.

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Figure 12. Optical Spectrum of Upstream IRZ.

Figure 13,14,15 and 16 shows the eye diagram of both DQPSK with OOK and DQPSK

with IRZ which are wide open having few transmission errors but in an acceptable range

to transmit the data. The power and BER of DQPSK/OOK downstream and upstream

are 3.41961x10

-046

and 4.10171x10

-018

and -8.168dB and -34.347dB whereas for

DQPSK/IRZ are 1.26888x10

-034

and 3.84401x10

-020

and -8.167dB and -37.824dB. From

the loss margin of both the systems i.e. -22.832dB and -8.153dB for downstream and

upstream of DQPSK/OOK and -34.343dB and -7.676dB, it can be seen that both systems

are feasible for High Data Rate NG-PON 2.

Figure 13. Eye Diagram of Downstream DQPSK with OOK upstream Signal.

Figure 14. Eye Diagram of Upstream OOK Signal.

Figure 15. Eye Diagram of Downstream DQPSK with IRZ upstream Signal.

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Figure 16. Eye Diagram of Upstream IRZ Signal.

Figure 17 and 18 shows the simulation results obtained on 10Km and back to back (B2B)

fiber span with downstream and upstream of both DQPSK with OOK and DQPSK with

IRZ. Figure 17 shows the comparison of downstream of both networks at 10Km and B2B

fiber length. Receiver sensitivity of DQPSK with IRZ at standard BER is much better than

DQPSK with OOK on both 10Km fiber span and B2B i.e. -31dB and -33dB at 10Km

fiber span and -32dB and -33.5dB at B2B. From Figure 17, it also can be seen that the

transmission power penalty of both networks at 10Km fiber span and B2B is 1dB and

0.5dB. Figure 18 shows the comparison of upstream of both networks at 10Km and B2B

fiber length. Receiver sensitivity of IRZ at standard BER is much better than OOK on

both 10Km fiber span and B2B i.e. -38dB and -42.5dB at 10Km fiber span and -38.5dB

and -45.5dB at B2B. From Figure 18, it also can be seen that the transmission power

penalty of both networks at 10Km fiber span and B2B is 0.5dB and 3dB. Comparison of

result is being mentioned in Table 2.

Table 2. Transmission Performance of DQSPK modulated downstream with OOK and IRZ modulated

upstreams.

NG-PON

Parameters

DQPSK with OOK

DQPSK with IRZ

Downstream

Upstream

Downstream

Upstream

Fiber Length

10Km

Rx Power

-8.168dB

-34.981dB

-8.167dB

-37.82dB

Bit Error Rate (BER)

3.42e-46

4.10e-18

1.27e-34

3.84e-20

Receiver Sensitivity

@ 1x10

-9

-31dB

-38dB

-33dB

-42.5dB

Optical Signal to

Noise Ratio (OSNR)

8.52e001

6.47e001

8.68e001

6.03e001

Txion Power Penalty

B2B vs 10Km

1dB

0.5dB

3dB

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Figure 17. Rx Power vs BER.

Figure 18. Rx Power vs BER.

Figure 19. Rx Power vs OSNR.

Figure 20. Rx Power vs OSNR.

Figure 19 and 20 shows the simulation results obtained on 10Km and back to back (B2B)

fiber span with downstream and upstream of both DQPSK with OOK and DQPSK with

IRZ. Figure 19 shows the comparison of Rx Power vs OSNR at downstream of both

-24 -25 -26 -27 -28 -29 -30 -31 -32 -33 -34 -35 -36 -37 -38 -39 -40 -41

1E-3

1E-4

1E-5

1E-6

1E-7

1E-8

1E-9

1E-10

1E-11

1E-12

1E-13

1E-14

1E-15

1E-16

1E-17

1E-18

1E-19

1E-20

BER (10Km) Downstream DQPSK/OOK

Rx Power

BER (10Km) Downstream DQPSK/OOK

BER (10Km) Downstream DQPSK/IRZ

BER (B2B) Downstream DQPSK/OOK

BER (B2B) Downstream DQPSK/IRZ

-34 -35 -36 -37 -38 -39 -40 -41 -42 -43 -44 -45 -46 -47 -48 -49 -50 -51 -52

1E-3

1E-4

1E-5

1E-6

1E-7

1E-8

1E-9

1E-10

1E-11

1E-12

1E-13

1E-14

1E-15

1E-16

1E-17

1E-18

1E-19

1E-20

BER (10Km) Upstream OOK

Rx Power

BER (10Km) Upstream OOK

BER (10Km) Upstream IRZ

BER (B2B) Upstream OOK

BER (B2B) Upstream IRZ

-24 -25 -26 -27 -28 -29 -30 -31 -32 -33 -34 -35 -36 -37 -38 -39 -40 -41

OSNR (10Km) Downstream DQPSK/OOK

Rx Power

OSNR (10Km) Downstream DQPSK/OOK

OSNR (10Km) Downstream DQPSK/IRZ

OSNR (B2B) Downstream DQPSK/OOK

OSNR (B2B) Downstream DQPSK/IRZ

-34 -35 -36 -37 -38 -39 -40 -41 -42 -43 -44 -45 -46 -47 -48 -49 -50 -51 -52

OSNR (10Km) Upstream DQPSK/OOK

Rx Power

OSNR (10Km) Upstream DQPSK/OOK

OSNR (10Km) Upstream DQPSK/IRZ

OSNR (B2B) Upstream DQPSK/OOK

OSNR (B2B) Upstream DQPSK/IRZ

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networks at 10Km and B2B fiber length. It can be seen that as the receiver sensitivity is

increased so does OSNR increased. Transmission performance of DQPSK with IRZ at

downstream is better compared to DQPSK with OOK as it works at higher receiver

sensitivity and OSNR. Figure 20 shows the comparison of Rx power vs OSNR at

upstream of both networks at 10Km and B2B fiber length. Here, it can also be seen that

IRZ works at higher receiver sensitivity and high OSNR compared to OOK.

From the results, it can be seen that DQPSK with IRZ network is much better than

DQPSK with OOK network in terms of performance as receiver sensitivity is high and

transmission power penalty is within the standard range.

4. CONCLUSIONS

In this paper, we have investigated two high data rate next generation passive optical

network 2 (NG-PON 2) with the same modulation DQPSK at downstream but different

modulation formats at upstream i.e. one is OOK and another one is IRZ at 10Km fiber

span. Simulated results validate that transmission performance of DQPSK with IRZ is

better than DQPSK with OOK in term of higher receiver sensitivity and better OSNR

values with very low transmission power penalties in both directions under the similar

simulative conditions.

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AUTHORS

Areez Khalil Memon, He has done B.E(Electronics) from Mehran

University of Engineering and Technology, Jamshoro, Sindh, Pakistan

(Jan, 2006 - March, 2010) and Masters From University of Leicester,

United Kingdom (UK) in MSc Advanced Electrical and Electronics

Engineering. Currently, he is doing PhD in Electrical Engineering from

Indus University, Karachi. He has 15 research publications in

conferences, IEEE proceedings and journal. A part from his teaching

and research activities he is also a member of Board of Studies and

Board of Faculty in Indus University. He has good knowledge of

Renewable Energy, Electrical Machines, Control Engineering and

Passive Optical Networks. His core research areas are Next Generation

Passive Optical Network 2 (NG-PON 2) and Energy efficient NG-PON

Ahmed Muddassir Khan, he has completed his early education from

prestigious institutes of Pakistan with distinctions. He completed B.E.

(Electronics) from Mehran University Jamshoro, M.Engg.

(Telecommunication) from NED University, Karachi and MBA from

Federal Urdu University, Karachi. He started his professional career as

a Telecom Engineer in Pakistan’s leading Telecom organization (PTCL)

and gained vast field and research experience in high capacity optical

networks. Then he started PhD from Beijing University of Posts and

Telecommunication (BUPT), Beijing, China. His research based on

implementation of Robust Advanced Modulation Formats for Cost

effective and High capacity Next Generation Passive Optical networks

(PON). He has completed PhD with several research publications in

esteemed international research journals. Currently, he is working in

Indus University, Karachi, as an Associate Professor and Chairperson of

Department of Electrical Engineering in Faculty of Engineering, Science

and Technology (FEST). He also has other important academic role and

responsibilities in Indus University such as Chair of BOS, member of

BOF, Academic Council, and R&D Committee. He is an approved PhD

supervisor and selected as an NTC Program evaluator by higher

education commission (HEC), Pakistan. He is also member of different

national and internal societies and speaker in different research forums.

He served as an organizing committee and technical Co-chair in IEEE

ICIEECT 2017. He also has successfully supervised ICT R&D funded

projects His core research areas are Optical Communication, DWDM,

GPON, Hybrid WDM/TDM-PON, Submarine Optical Fiber Cable

Networks, Advanced Modulation Formats and Next Generation Passive

Optical Networks (NGPON).

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Sayed Hyder Abbas Musavi, He is PhD and ME in Telecommunication

Engineering under HEC Scholarship and B.E. in Electronics

Engineering from Mehran University of Engineering and Technology,

Pakistan. He is currently serving as Dean Faculty of Engineering Science

and Technology Indus University Karachi. Previously he was engaged

as Chairman Department of Electrical and Electronics Engineering

Hamdard University Karachi. In past he has served as Professor and

Principal at Petroman- an Institute of Ministry of Information

Technology and Telecommunications, Government of Pakistan at its

various campuses for more than 10 years and had also remained

Executive District Officer IT (EDO-IT) District Government Larkana.

To his credit are more than 30 research publications in national and

international journals. Dr. Musavi has attended numerous international

conferences as invited speaker. He is on review board of two impact

factor international journals. He is member of numerous national and

international societies including member IEEEP Karachi local council,

IEEE, IEEE Computer society, IEEE Signal Processing Society, IEEE

Devices and Circuits Society, IEEE Communications Society etc. He was

General Chair in IEEE ICIEECT 2017.

Faizan ur Rehman, Computer Systems Engineer from COMSATS

Institute of Information Technology (CIIT) Wah Cantt and Masters in

Electrical Engineering from National University of Computer and

Emerging Science (NUCES-FAST) Lahore. He is currently working at

Indus University Karachi as a Lecturer. His areas of research are Next

Generation Passive Optical Networks and Speaker Recognition System.

Engr. Atif Mehmood has completed his Bachelor of Computer

Engineering from COMSATS IIT Wah cantt and Master in Electrical

Engineering from FAST (National University of computer and

Emerging Sciences). He joined Commtel System as Field Incharge

Engineer and works on HEC Smart University Project in different

universities in 2016. He also completed multiple projects in different

industries like Bestway Cement, Pakistan Tobacco Company, Askari

Cement, Cherat Cement, English Biscuit Manufacturer, Nishat Paper

Mill. His areas of research are Next Generation Passive Optical

Networks and Parallel Synchronization of Grid Stations.

Engr. Sajid Hussain is PEC Certified Engineer with B.E in Electronics.

Currently doing M.Engg in Industrial Electronics. Has working

experience of around 3 years in different industries. His areas of

research are Next Generation Passive Optical Networks.

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