Investigating The Performance Of Underwater Wireless Optical Communication with Intensity Modulation Direct Detection Technique

AbstractThe hybrid optical code-division multiple-access over wavelength-division multiplexing (OCDMA/WDM) scheme has attractive features of supporting system reach, multi Gbps data rates, security, and robustness for optical communication networks. This paper presents the performance of such scheme under DPSK and QPSK modulation formats using spectral direct detection technique. The modified double weight (MDW) code is used as spectral amplitude coding which also acts as a signature address code for the OCDMA system. The MDW code has the advantage of reducing the multiple access interference (MAI) and enhancing the security of the proposed hybrid system. The study focuses on the comparison between the two advanced modulation techniques (DPSK, QPSK) using spectral direct detection. Simulation results show bit-error-rate (BER) ≤10–09 for up to 25 km distance at the bit rate of 1 Gbps for optical communication networks.

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Rate adaptive multilevel coded modulation with high coding gain in intensity modulation direct detection optical communication

Optical Engineering ◽

10.1117/1.oe.57.2.026107 ◽

2018 ◽

Vol 57 (02) ◽

pp. 1

Keyword(s):

Optical Communication ◽

Direct Detection ◽

Coded Modulation ◽

Intensity Modulation ◽

Coding Gain ◽

Rate Adaptive

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Performance Estimation of Advanced Intensity Modulation Formats Using Hybrid SAC-OCDMA through IsOWC Channel

Journal of Optical Communications ◽

10.1515/joc-2018-0088 ◽

2018 ◽

Vol 0 (0) ◽

Author(s):

Himali Sarangal ◽

Simrandeep Singh Thapar ◽

Paramjot Singh ◽

Isha Sharma ◽

Harmandar Kaur

Keyword(s):

Optical Communication ◽

Direct Detection ◽

Network Capacity ◽

Intensity Modulation ◽

Performance Estimation ◽

Spectral Amplitude ◽

Long Distance ◽

Modulation Formats ◽

Eye Diagram ◽

Code Division Multiple

AbstractSpectral amplitude coding optical code division multiple access (SAC-OCDMA) is one of the most important multiplexing schemes of OCDMA that has turned out to be a stimulating investigating area in optical communication due to its increased privacy, network capacity and its flexibility in allocating the channels and asynchronous environment. On the other hand, Inter-satellite optical wireless communication (IsOWC) which is a favorable area of research in optical communication is useful for bursty transmissions and long-distance communications. In this paper, we have designed a hybrid SAC-OCDMA system through IsOWC channel using ZCC code for advanced intensity modulation formats (CSRZ, Db, and AMI). The investigation is done for four users at a bit rate of 40(4×10) Gb/s using a direct detection technique. Further, on comparing the proposed system using advanced intensity modulation formats, the result shows that system using CSRZ format is better in terms of BER, Q-factor, SNR and the eye diagram with respect to AMI and Db.

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