High-power and high-efficiency distributed feedback (DFB) lasers operating in the 1.4-1.6 μm range for eye-safe applications

Garrod, T.; Brunet, François; Galstad, C.; Klaus, Michael; Olson, D. T.; Zenner, C.; Xiao, Yi; Mawst, Luke J.; Botez, D.

doi:10.1117/12.2004060

Cited by 5 publications

(4 citation statements)

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“…When implementing an UDWDM-PON, for each ONU, a TL is needed as local oscillator (LO) for coherent reception and another TL for transmission, and two different λs are used for down and up transmission to avoid Rayleigh backscattering (RB) at the single-fiber PON transmission. The tuning range of the lasers is a key parameter for achieving a low-cost implementation of the ONU; such narrow channel spacing enables to choose simple DFB lasers, with limited tunability of only about ±1.6 nm by simple temperature control [17,18]; VCSEL lasers could be similarly used, with lower performances. Employing DFB-lasers in direct modulation and coherent detection schemes has been shown [19].…”

Section: Introductionmentioning

confidence: 99%

Flexible coherent UDWDM-PON with dynamic user allocation based on limited-tunability lasers

Segarra

Sales

Polo

et al. 2020

J. Opt. Commun. Netw.

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Coherent WDM technologies have leveraged the optical communication systems in core networks, increasing the fiber capacity by transmission with advanced modulation formats and mitigation of impairments with digital signal processing (DSP). However, these solutions are too expensive for access networks, where cost, power budget and footprint are limited. Hence, the key technology will be developing low-cost coherent transceivers providing an excellent selectivity, and giving high sensitivity, which allows high splitting ratios. This article reports an experimental design of a low-cost coherent ultra-dense WDM-PON (UDWDM-PON) with 6.25 GHz channel spacing. The users´ optical network unit (ONU) is built employing coherent transceivers with two paired low-cost DFB lasers, one as local oscillator and another as transmitter, offering simplicity and low-cost hardware; likewise, the optical line terminal (OLT) at central office can profit from the same design. The ONU DFB lasers have wavelengths with limited thermal tunability, controlled by a thermo-electric cooler (TEC), which is used to allocate the wavelengths. A medium access control (MAC) at the OLT manages the spectrum channel allocation for ONUs demanding connection when activation is requested: the OLT furnishes an optical carrier wavelength for the ONU to obtain connection by a control algorithm, assigning a down-channel and another paired up-channel assigned to the ONU DFB transmitter. The MAC can reassign the channels because of interference or collision in a dynamic wavelength allocation (DWA). Measures in an activation process and in channel reassignment have been performed in environment conditions, including control signals and physical parameters of DFB lasers, demonstrating the practical viability of the PON scaling from 32 up to 256 wavelength channels.

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Section: Introductionmentioning

confidence: 99%

Flexible coherent UDWDM-PON with dynamic user allocation based on limited-tunability lasers

Segarra

Sales

Polo

et al. 2020

J. Opt. Commun. Netw.

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“…The tuning range of the lasers is a key parameter for achieving a low-cost implementation of the ONU, leading to choose single-mode single-electrode semiconductor lasers, like distribute feedback (DFB), but with limited tunability of about 0.1nm/ºC by heating and/or cooling control [15][16]. Using ECL-lasers in coherent detection [17] and DFB-lasers in direct modulation schemes has been shown [18].…”

Section: Introductionmentioning

confidence: 99%

UDWDM-PON Using Low-Cost Coherent Transceivers With Limited Tunability and Heuristic DWA

Sales¹,

Segarra²,

Polo³

et al. 2016

J. Opt. Commun. Netw.

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“…In contrast, low cost TLs with narrow tunability like conventional DFB-lasers, with heating/cooling control, present very simple and reliable tuning function. Its operating temperature changes the wavelength in about 0.1 nm/ºC [10], [11]; providing a continuous but limited tuning range. On the other hand, typical production of DFB-lasers yields random emitting wavelengths varying over few nanometers range [10]; this range can be extended to the intended PON band, of e.g.…”

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confidence: 99%

Statistical UDWDM-PONs Operating With ONU Lasers Under Limited Tunability

Sales

Segarra

Polo

et al. 2015

IEEE Photon. Technol. Lett.

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Abstract-We explore a new wavelength management for ultra-dense WDM-PONs with randomly distributed ONU wavelengths, controlled with limited thermal tunability. Static and dynamic wavelength assignment paradigms and heuristic assignment schemes for spectrum management are proposed, simulated and compared. ONU acceptances in activation processes and ONU availability ratios up to 99.99% are obtained in standard environmental conditions.

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High-power and high-efficiency distributed feedback (DFB) lasers operating in the 1.4-1.6 μm range for eye-safe applications

Cited by 5 publications

References 0 publications

Flexible coherent UDWDM-PON with dynamic user allocation based on limited-tunability lasers

Flexible coherent UDWDM-PON with dynamic user allocation based on limited-tunability lasers

UDWDM-PON Using Low-Cost Coherent Transceivers With Limited Tunability and Heuristic DWA

Statistical UDWDM-PONs Operating With ONU Lasers Under Limited Tunability

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