A Novel Orbital Angular Momentum Coding System Using High Order Azimuthal Indices of Laguerre Gaussian Beams

İbrahim Yazıcı; Çağlar Duman

Makale detayları

A Novel Orbital Angular Momentum Coding System Using High Order Azimuthal Indices of Laguerre Gaussian Beams

Yazarlar:

İbrahim Yazıcı | Çağlar Duman

Yayıncı:

Fırat University

Ana Başlıklar:

Data Communications

Dergi:

Turkish Journal of Science and Technology Vol.20 Issue 2, pp.455-464

Belge Tipi:

Makale

Yayın Tarihi:

9/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001357980

pISSN:

1308-9080

Anahtar kelimeler:

Özet:

 Orbital angular momentum in optical vortex beams offers a new dimension of space mode because coaxially propagating optical vortex beams with different azimuthal orbital angular momentum states are mutually orthogonal. The optical vortex beams can be efficiently multiplexed and demultiplexed to increase the capacity of the optical communication system. Therefore, the azimuthal and radial indices of the transverse spatial mode have been investigated many times. This paper focused on the azimuthal indices of the Laguerre Gaussian beams and a novel orbital angular momentum coding system under the influence of turbulence and noise with high order azimuthal indices was established through simulations of an optical communication system in free space. At the transmitter, a series of holograms of Laguerre Gaussian mode with different azimuthal indices were used to achieve coaxial transmission of multiplexed beams, where each beam represented a data bit. At the receiver, superposition of the conjugate light field corresponding to the transmitted beams was used to demultiplex the multiplexed beams. The combination of the phase shift factor and the centroid algorithm were realized for simultaneous detection of the azimuthal indices in each channel and efficient decoding of the information. In this article, for the first time, multiplex and demultiplex were investigated by using the centroid algorithm, keeping the radial index constant and taking different positive and negative values of the azimuthal index. Simulation results show that using four orthogonal LG modes M  4 achieves a MIMO capacity of 18.802 bitssHz at 20 dB SNR, providing about a threefold increase over single-mode transmission, while turbulence reduces mode purity to 6.02 dB to 1.25 dB and induces an average crosstalk of 4.77 dB.

 Orbital angular momentum in optical vortex beams offers a new dimension of space mode because coaxially propagating optical vortex beams with different azimuthal orbital angular momentum states are mutually orthogonal. The optical vortex beams can be efficiently multiplexed and demultiplexed to increase the capacity of the optical communication system. Therefore, the azimuthal and radial indices of the transverse spatial mode have been investigated many times. This paper focused on the azimuthal indices of the Laguerre Gaussian beams and a novel orbital angular momentum coding system under the influence of turbulence and noise with high order azimuthal indices was established through simulations of an optical communication system in free space. At the transmitter, a series of holograms of Laguerre Gaussian mode with different azimuthal indices were used to achieve coaxial transmission of multiplexed beams, where each beam represented a data bit. At the receiver, superposition of the conjugate light field corresponding to the transmitted beams was used to demultiplex the multiplexed beams. The combination of the phase shift factor and the centroid algorithm were realized for simultaneous detection of the azimuthal indices in each channel and efficient decoding of the information. In this article, for the first time, multiplex and demultiplex were investigated by using the centroid algorithm, keeping the radial index constant and taking different positive and negative values of the azimuthal index. Simulation results show that using four orthogonal LG modes M  4 achieves a MIMO capacity of 18.802 bitssHz at 20 dB SNR, providing about a threefold increase over single-mode transmission, while turbulence reduces mode purity to 6.02 dB to 1.25 dB and induces an average crosstalk of 4.77 dB.

 Orbital angular momentum in optical vortex beams offers a new dimension of space mode because coaxially propagating optical vortex beams with different azimuthal orbital angular momentum states are mutually orthogonal. The optical vortex beams can be efficiently multiplexed and demultiplexed to increase the capacity of the optical communication system. Therefore, the azimuthal and radial indices of the transverse spatial mode have been investigated many times. This paper focused on the azimuthal indices of the Laguerre Gaussian beams and a novel orbital angular momentum coding system under the influence of turbulence and noise with high order azimuthal indices was established through simulations of an optical communication system in free space. At the transmitter, a series of holograms of Laguerre Gaussian mode with different azimuthal indices were used to achieve coaxial transmission of multiplexed beams, where each beam represented a data bit. At the receiver, superposition of the conjugate light field corresponding to the transmitted beams was used to demultiplex the multiplexed beams. The combination of the phase shift factor and the centroid algorithm were realized for simultaneous detection of the azimuthal indices in each channel and efficient decoding of the information. In this article, for the first time, multiplex and demultiplex were investigated by using the centroid algorithm, keeping the radial index constant and taking different positive and negative values of the azimuthal index. Simulation results show that using four orthogonal LG modes M  4 achieves a MIMO capacity of 18.802 bitssHz at 20 dB SNR, providing about a threefold increase over single-mode transmission, while turbulence reduces mode purity to 6.02 dB to 1.25 dB and induces an average crosstalk of 4.77 dB.

 Optik vorteks OV ışınlarındaki yörüngesel açısal momentum OAM, uzay modunun yeni bir boyutunu sunar çünkü farklı azimuthal OAM durumlarına sahip eş eksenli olarak yayılan optik vorteks ışınları karşılıklı olarak ortogonaldir. Optik iletişim sisteminin kapasitesini potansiyel olarak artırmak için ışınlar verimli bir şekilde çoğullanabilir ve çoklanabilir. Bu nedenle, şimdiye kadar, enine uzamsal modun azimutal ve radyal indeksleri birçok kez araştırılmıştır. Bu makale, Laguerre Gaussian LG ışınının azimuthal indislerine odaklanmaktadır. Optik iletişim sistemi için simülasyon yoluyla yüksek dereceli azimuthal indekslere sahip türbülans ve gürültü etkisi altında yeni bir OAM kodlama sistemi kurulmuştur. Vericide, farklı azimuthal indekslere sahip Laguerre Gaussian modunun bir dizi hologramı, her bir ışının bir veri bitini temsil ettiği çoklama ışınlarının koaksiyel iletimini sağlamak için kullanılır. Alıcıda, çoklanmış ışınları çoğullamadan arındırmak için iletilen ışınlara karşılık gelen eşlenik ışık alanının süperpozisyonu kullanılır. Faz kaydırma faktörü ve centroid algoritmasının kombinasyonu, her kanaldaki azimuthal indekslerin eş zamanlı olarak algılanmasını ve bilginin verimli bir şekilde çözülmesini gerçekleştirir. Makalede bir kodlama sisteminin performansına dair tartışmaları veriyoruz. Simülasyon sonuçları, dört ortogonal LG modu M  4 kullanıldığında 20 dB SNRde 18,802 bitsHzlik bir MIMO kapasitesi elde edildiğini göstermektedir. Bu, tek modlu iletimlere göre yaklaşık üç kat artış sağlarken, türbülans mod saflığını 6,02 dBden 1,25 dBye düşürür ve ortalama 4,77 dBlik bir çapraz konuşma oluşturmuştur.

Makale detayları

A Novel Orbital Angular Momentum Coding System Using High Order Azimuthal Indices of Laguerre Gaussian Beams

Yazarlar:

İbrahim Yazıcı | Çağlar Duman

Yayıncı:

Fırat University

Ana Başlıklar:

Data Communications

Dergi:

Turkish Journal of Science and Technology Vol.20 Issue 2, pp.455-464

Belge Tipi:

Makale

Yayın Tarihi:

9/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001357980

pISSN:

1308-9080

Free space communication

laguerre gauss beams

orbital angular momentum

multiplexing and demultiplexing

optical communication systemSerbest uzay haberleşmesi

laguerre gauss ışınları

yörüngesel açısal momentum

çoklama ve çoklama çözme

optik iletişim sistemi

Sayı

Makale detayları

Yazarlar: İbrahim Yazıcı | Çağlar Duman

Yayıncı: Fırat University

Ana Başlıklar: Data Communications

Dergi: Turkish Journal of Science and Technology Vol.20 Issue 2, pp.455-464

Belge Tipi: Makale

Yayın Tarihi: 9/2025

Belge Dili: İngilizce

Document ID (Org No.): 2001357980

pISSN: 1308-9080

Sayı

Yazarlar:

İbrahim Yazıcı | Çağlar Duman

Yayıncı:

Fırat University

Ana Başlıklar:

Data Communications

Dergi:

Turkish Journal of Science and Technology Vol.20 Issue 2, pp.455-464

Belge Tipi:

Makale

Yayın Tarihi:

9/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001357980

pISSN:

1308-9080