Cost-effective up to 40 Gb/s transmission performance of 1310 nm directly Modulated lasers for short- to medium-range distances

Huiszoon, B.; Jonker, R.J.W.; Bennekom, P.K. van; Khoe, G.D.; Waardt, H. de

doi:10.1109/jlt.2004.841435

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…The first one, taken after Ref. 7, describes 10 Gb/s rated MQW-DFB device (D1861A by Agere). The second one was obtained by the author for the slower, 2.5 Gb/s rated laser (PT3563 by Photon).…”

Section: Transmission System Modellingmentioning

confidence: 99%

Directly modulated lasers in negative dispersion fiber links

Krehlik

2007

Opto-Electronics Review

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In the paper the impact of frequency chirp of directly modulated lasers is considered in context of high-speed data transmission over negative dispersion fiber. Chirp/dispersion induced signal distortions are described, and detailed investigations of their influence on 10 Gb/s transmission system performance are presented. The desired laser chirp characteristics and optimal driving conditions are determined. It is also demonstrated that directly modulated laser with low chirp offers similar or even better dispersion tolerance than unchirped (externally modulated) source. Experimental verification of described investigations is presented at the end.

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Section: Transmission System Modellingmentioning

confidence: 99%

Directly modulated lasers in negative dispersion fiber links

Krehlik

2007

Opto-Electronics Review

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“…Directly modulated lasers (DMLs), as opposed to the externally modulated lasers (EMLs) [ 6 , 7 , 8 , 9 , 10 ], are preferred for their low fabrication cost and high yield since there are no complicated monolithic integration technologies, such as butt-joint regrowth or selective area growth, involved [ 11 , 12 ]. To accommodate the high-speed modulation requirement in the aforementioned applications, a significant amount of effort has been devoted to extending the modulation bandwidth of the distributed feedback (DFB) DMLs mainly by raising their relaxation oscillation frequency caused by the carrier–photon resonance (CPR) [ 13 , 14 , 15 ]. The single-sectional DFB DML seems to have reached the upper limit of its modulation bandwidth (~25 GHz), and most of the recent works are focused on various multiple-sectional DFB-DML designs that exploit the photon–photon resonance (PPR) to further enlarge the bandwidth [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers

Chi

Niu

et al. 2023

Micromachines

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The bandwidth of a distributed feedback (DFB) directly modulated laser (DML) is limited by its carrier–photon resonance (CPR) frequency. A viable approach to break the bottleneck is to introduce a photon–photon resonance (PPR), since the PPR can happen at a much higher frequency than the CPR. Among the many structures that can possibly generate the PPR, the dual-sectional push–pull modulated (PPM) DFB is of particular interest for its fabrication cost-effectiveness as no regrowth is required. The PPR in the PPM DFB, however, usually shows a rapid roll-off on both edges, which brings in an indentation on the lower frequency side of the PPR peak and, consequently, cuts off the bandwidth. To compensate for this dip, we introduce a detuned PPR and restart the CPR response by exploiting a time delay between the differential signals applied to the PPM DFB. Our simulation result shows that the broadened PPR peak and the restarted CPR response indeed mitigate the dip and effectively expand the PPM-DFB’s bandwidth to approximately 50 GHz, a value double that of the conventional (single-sectional) DFB DML.

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“…To solve this problem, many works have been done to optimize the quantum well structure (by, e.g., introducing tensile strain and/or doping the barrier) and reduce the cavity length, since the CPR frequency is proportional to the differential gain and inversely proportional to the cavity length in a square root manner [7], [8], [9], [10]. A transmission rate up to 40 Gbps has been achieved by using such laser source [11], [12], [13]. However, further reduction of the cavity length is restricted by cleaving and thermal dissipating difficulties.…”

Section: Introductionmentioning

confidence: 99%

Output Optical Power Enhancement of Push-Pull Modulated DFB Laser With Asymmetric Structure

Chi,

Li,

Niu

et al. 2023

IEEE Photonics J.

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Conventional push-pull modulated (PPM) distributed feedback (DFB) lasers exploit structures with symmetry, which wastes a significant amount of the optical power output from the rear facet. To improve the power efficiency, PPM DFB lasers with asymmetrically coated facets can be considered. However, the resulted imbalanced push-pull modulation causes a dip in device small-signal intensity modulation response near the carrier-photon resonance (CPR) frequency, which distorts the waveform and even cuts off the bandwidth. This work proposes an asymmetric section length design in conjunction with the asymmetric facet coating to offset the aforementioned effect on device intensity modulation response. With a delayed push-pull modulation (DPPM) scheme further incorporated, our simulation result shows that the PPM DFB laser with optimized asymmetric structure can enhance the power efficiency and maintain a smooth modulation bandwidth up to around 50 GHz.

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Cost-effective up to 40 Gb/s transmission performance of 1310 nm directly Modulated lasers for short- to medium-range distances

Abstract: Cost-effective up to 40 Gbit/s transmission performance of 1310 nm directly modulated lasers for short to medium range distances.

Cited by 17 publications

References 16 publications

Directly modulated lasers in negative dispersion fiber links

Directly modulated lasers in negative dispersion fiber links

Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers

Output Optical Power Enhancement of Push-Pull Modulated DFB Laser With Asymmetric Structure

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