Optical Channel Selection Avoiding DIPP in DSB-RFoF Fronthaul Interface

Zakrzewski, Zbigniew

doi:10.3390/e23111554

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…Power fading can (analytically) be represented by the PP function (of two variables, i.e., fiber length L and modulation frequency f RF ), which is basically given as the ratio of the optical powers at the receiving end and that from the transmitting end of the RoF link, as per Equation (13) in [8] PP…”

Section: Dispersion-induced Power Fadingmentioning

confidence: 99%

“…In an intensity-modulated A-RoF link, given its typical double-sideband spectral profile, this causes a relative phase shift between both sidebands and effectively presents us with an unfavorable frequency-and length-dependent power fading [6]. While there are several ways [6][7][8] to mitigate this issue, introducing a two-color signal, such as an optical single-sideband (OSSB) signal [9,10] or an optical double-sideband (ODSB) signal with a suppressed carrier (SC) [11][12][13][14][15], is a robust and universal solution that does not depend on the fiber's length and can therefore be applied to various optical network topologies, e.g., point-to-multipoint. A wide variety of techniques for establishing a two-color spectral profile has been proposed and demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Analog Wavelength Locking in an Optical Single-Sideband Transmitter of a Millimeter-Wave Radio-Over-Fiber Link Featuring a Micro-Ring Resonator and a Heat-Pump-Controlled Laser

Vuk Baliž,

Debevc,

Vidmar

et al. 2023

Photonics

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This paper presents a novel approach to addressing the issue of temperature-induced instability in an optical, single-sideband transmitter based on a micro-ring resonator (MRR) suitable for millimeter-wave (mmW) radio-over-fiber (RoF) communications. We propose utilizing the drop port of the MRR to provide a feedback signal to the closed-loop control (CLC) system. The latter serves to maintain the optimal alignment between the laser’s carrier and the MRR’s resonant wavelength, thus mitigating the adverse effects of chromatic-dispersion-induced power fading at the receiving end. Since the feedback information is extracted from the otherwise-wasted resonant energy at the drop port, the control system does not compromise the delicate optical signal at the through port. A CLC was synthesized, designed, and prototyped to provide real-time wavelength tuning of the heat-pump-controlled laser based on the feedback signal. Experimental evaluations demonstrate that the wavelength of the laser could be successfully locked to the MRR’s resonance with a wavelength dither of less than 0.004 nm (~491 MHz). This allowed us to limit the power-penalty deterioration to less than 2 dB for a RoF link with a 2.5-km standard telecommunication single-mode fiber (SMF), a modulation frequency of 37.8 GHz, and a carrier wavelength of 1563.97 nm (~191.820 THz). The proposed solution offers an alternative approach for the carrier and the MRR’s resonant wavelength interlocking without the need for complex photonics like thermo-optic or electro-optic structures to control the temperature or phase velocity, respectively.

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Section: Dispersion-induced Power Fadingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analog Wavelength Locking in an Optical Single-Sideband Transmitter of a Millimeter-Wave Radio-Over-Fiber Link Featuring a Micro-Ring Resonator and a Heat-Pump-Controlled Laser

Vuk Baliž,

Debevc,

Vidmar

et al. 2023

Photonics

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“…In [ 8 ], the problem of selecting an optical channel for transporting the double sideband radio-frequency-over-fiber (DSB-RFoF) radio signal over the optical fronthaul path, avoiding the dispersion-induced power penalty (DIPP) phenomenon, is addressed. The presented method complements the possibilities of a short-range optical network working in the flexible dense wavelength division multiplexing (DWDM) format, where chromatic dispersion compensation is not applied.…”

mentioning

confidence: 99%