Multiwavelength Optical Source for OCDM Using Sinusoidally Modulated Laser Diode

Yoshino, Masao; Miki, Noriki; Yoshimoto, Naoto; Kumozaki, Kiyomi

doi:10.1109/jlt.2009.2024626

Cited by 21 publications

(4 citation statements)

References 10 publications

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“…A DFB LD with direct modulation will create intensity modulation (square root items) and phase modulation (exponent items) concurrently. The power difference among optical carriers can be reduced with an enhanced effect of phase modulation 27 . The multiple carrier generator's optical spectra before and after the OSNR enhancement setup are exhibited in Fig.…”

Section: Schematic Diagram Of Multiple Carrier Generator With Opticalmentioning

confidence: 99%

A PDM-based 128-Gb/s PAM4 fibre-FSO convergent system with OBPFs for polarisation de-multiplexing

et al. 2020

Sci Rep

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A polarisation-division-multiplexing (PDM)-based four-level pulse amplitude modulation (PAM4) fibrefree-space optical (FSO) convergent system with optical band-pass filters (OBPFs) for polarisation de-multiplexing is feasibly demonstrated for the first time. In a PDM scenario with PAM4 modulation, the transmission capacity of fibre-FSO convergent systems is enhanced four times with an aggregate channel capacity of 128 Gb/s (64 Gb/s PAM4/polarisation × 2 polarisations). With an OBPF, polarisationtracking free de-multiplexing is attained by eliminating other optical carrier with orthogonal polarisation. An OBPF is a simple polarisation de-multiplexing scheme in which the polarisationorthogonal carrier can be effectively de-multiplexed and the cross-polarisation interference can be nearly eliminated. Compared with traditional PDM-based fibre-FSO convergent systems with sophisticated polarisation-tracking mechanism and elaborate digital signal processing (DSP) approach, it reveals a noteworthy one with the advantage of simplicity. Through 25 km single-mode fibre transport and 500 m FSO link, sufficiently low bit error rate and qualified PAM4 eye diagrams are attained. This proposed polarisation-tracking free PDM-based fibre-FSO convergent system is notable because it not only incorporates the fibre backbone and optical wireless feeder, but it also simplifies the framework since complicated polarisation-tracking mechanism and DSP approach are not involved. In the past few years, fibre-free-space optical (FSO) convergent systems have attracted considerable attention to connect fibre backbone and optical wireless feeder networks. Fibre-FSO convergence can make use of the traits of optical fibre and optical wireless communications, such as the naturally significant bandwidth of optical fibre and the unlicensed electromagnetic spectrum of optical wireless communication 1,2. To incorporate the huge bandwidth of fibre backbone and the flexibility of optical wireless feeder, fibre-FSO convergent systems present a powerful scenario for providing present and emerging technologies, such as the broadband Internet, virtual/ augmented reality, 4 K/8 K video streaming, and 5 G/Pre-6G mobile communications 3-7. Compared with previous communication systems, fibre-FSO convergent systems can provide not only high transmission capacity but also satisfactory mobility. Data center interconnect traffic is growing rapidly, along with the increasing popularity of Internet and mobile telecommunication applications. Such exponential growth of data-transmission loading has pushed the requirements for high transmission capacity. A polarisation-division-multiplexing (PDM) scenario has been explored to provide high transmission capacity 8-10. In the PDM scenario, the transmission capacity of fibre-FSO convergent systems can be improved. Moreover, to further enhance the transmission capacity, four-level pulse amplitude modulation (PAM4) rather than none-return-to-zero (NRZ) modulation is adopted, provided that PAM4 modulation is an efficient approa...

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Section: Schematic Diagram Of Multiple Carrier Generator With Opticalmentioning

confidence: 99%

A PDM-based 128-Gb/s PAM4 fibre-FSO convergent system with OBPFs for polarisation de-multiplexing

et al. 2020

Sci Rep

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“…It has the characteristics of photonic bandgap [5,6] and photonic localization [7][8][9]. Based on this characteristic, photonic crystals are widely used in various photonic devices, such as photonic bandgap [10,11], filters [12], beam splitters [13][14][15], switches [16], multiplexers [17], and modulators [18][19][20]. Photonic crystal fibers (PCFs) and polymer optical fibers (POFs) are often used in multiplexers, demultiplexers, combiners, Photonics 2021, 8, 198 2 of 11 beam splitters, and other applications [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Compact Photonic Crystal Polarization Beam Splitter Based on the Self-Collimation Effect

et al. 2021

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We propose a new compact polarization beam splitter based on the self-collimation effect of two-dimensional photonic crystals and photonic bandgap characteristics. The device is composed of a rectangular air holes-based polarization beam splitting structure and circular air holes-based self-collimating structure. By inserting the polarization beam splitting structure into the self-collimating structure, the TE and TM polarized lights are orthogonally separated at their junction. When the number of rows in the hypotenuse of the inserted rectangular holes is 5, the transmittance of TE polarized light at 1550 nm is 95.4% and the corresponding polarization extinction ratio is 23 dB; on the other hand, the transmittance of TM polarized light is 88.5% and the corresponding polarization extinction ratio is 37 dB. For TE and TM polarized lights covering a 100 nm bandwidth, the TE and TM polarization extinction ratios are higher than 18 dB and 30 dB, respectively. Compared with the previous polarization beam splitters, our structure is simple, the size is small, and the extinction ratio is high, which meets the needs of modern optical communications, optical interconnection, and optical integrated systems.

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“…The drawback of this scheme is that it requires high phase stabilization between the received signal and the local light signal. In [25] Yoshino et al proposed a cost efficient well flattened multi wavelength source that can be used in SAC OCDMA as an alternative to the more expensive multi laser source. In [26], we proposed the use of wavelength multiplexed SAC OCDMA codes in order to improve the performance of highly populated coherent source SAC OCDMA networks.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Performance of Coherent Sources SAC OCDMA Networks via Spatial Multiplexing

Alhassan¹,

Badruddin²,

Saad³

et al. 2013

Journal of the Optical Society of Korea

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The beating of two or more lasers that have the same or a finite difference in the central frequencies, is the main source of noise in spectral amplitude coding optical code division multiple access (SAC OCDMA) systems. In this paper we adopt a spatial multiplexing (SM) scheme for SAC OCDMA systems to mitigate this beat noise. The results show that for different code weights and different data rates SM SAC can support a larger number of users than the conventional SAC for all different laser source configurations. However, SM SAC requires a more complex system than the conventional SAC, and almost twice as much optical component.

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Multiwavelength Optical Source for OCDM Using Sinusoidally Modulated Laser Diode

Cited by 21 publications

References 10 publications

A PDM-based 128-Gb/s PAM4 fibre-FSO convergent system with OBPFs for polarisation de-multiplexing

A PDM-based 128-Gb/s PAM4 fibre-FSO convergent system with OBPFs for polarisation de-multiplexing

Compact Photonic Crystal Polarization Beam Splitter Based on the Self-Collimation Effect

Enhancing the Performance of Coherent Sources SAC OCDMA Networks via Spatial Multiplexing

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