Comparative analysis of chirped, AMI and DPSK modulation techniques in IS-OWC system

A high‐speed long‐haul wavelength division multiplexing–based inter‐satellite optical wireless communication link using spectral‐efficient 2‐D orthogonal modulation scheme

“…Similarly, it can be observed that the proposed link performs considerably better in terms of information rate and maximum link reach as compared to the works reported in the previous studies . Alipour et al have incorporated MDRZ modulation, whereas Kaur et al incorporate NRZ modulation and R. Kaur and H. Kaur incorporate AMI modulation.…”

“…In order to achieve high information transmission capacity in IsOWC links, researchers have proposed the incorporation of wavelength division multiplexing (WDM) technique in recent works . S. Chaudhary et al investigated the development and performance analysis of an IsOWC link based on six channel WDM architecture with the incorporation of polarization interleaving for improved performance .…”

“…A. Alipour et al reported the performance comparison of a 64‐channel WDM‐based IsOWC link operated at 10, 20, and 40 Gbps with 250 km of transmission range incorporating carrier‐suppressed return‐to‐zero (CSRZ), duobinary return‐to‐zero (DRZ), and modified duobinary return‐to‐zero (MDRZ) modulation techniques . The designing and performance investigation of a 32 × 10‐Gbps dense DWDM‐based IsOWC link with 150 GHz of channel spacing at 5000 km of transmission range has been demonstrated in Kaur et al R. Kaur et al reported the performance comparison of chirped return‐to‐zero, alternate mark inversion, and differential phase shift keying (DPSK) modulation techniques in a 64‐channel IsOWC system operated at 10, 20, and 40 Gbps over 3000 km of transmission range . In another work, a cost‐effective 100‐Gbps IsOWC link has been proposed by incorporating hybrid spectral amplitude coding‐optical code division multiple access‐polarization division multiplexing (SAC‐OCDMA‐PDM) under the influence of space turbulence (ie, pointing error losses).…”

Comparative investigation of CSRZ‐DQPSK, DRZ‐DQPSK, and MDRZ‐DQPSK modulation techniques in MDM IS‐OWC system

“…For the setup of 64 channel IS‐OWC system, received power ( R P ) depends on the transmitted power ( T P ) and it is calculated as follows: where τ OD is the optical depth …”

“…The concept of DWDM was introduced as it utilizes the potential bandwidth of the wireless channel to implement multiple channels simultaneously and achieve high bandwidth efficiency. To fulfill it, various modulation schemes like chirped, alternate mark inversion (AMI), and dual polarization phase shift keying (DPSK) were proposed at the bit rate of 40 Gbps by researchers . Use of NRZ, RZ, and CSRZ modulation formats were also investigated at 40 Gb/s where RZ and CSRZ provides best results than NRZ modulation formats .…”