Low-chirp and enhanced-resonant frequency by direct push-pull modulation of DFB lasers

Nowell, M.C.; Carroll, J.E.; Plumb, R.G.; Marcenac, D.D.; Robertson, M.J.; Wickes, H.J.; Zhang, L.M.

doi:10.1109/2944.401226

Cited by 24 publications

(6 citation statements)

References 23 publications

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“…The PPM DFB can potentially extend the modulation bandwidth since its PPR can appear at a much higher frequency than the CPR [ 34 , 35 ]. However, the modulation response of the PPM DFB has a huge indentation on the lower frequency side of the PPR peak [ 36 ], which makes the PPR ineffective as the bandwidth will still be cut off.…”

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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Section: Introductionmentioning

confidence: 99%

Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers

Chi

Niu

et al. 2023

Micromachines

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“…One possible means to overcome the restriction of relaxation oscillation is to utilize photon-photon resonance (PPR) [7][8][9][10][11][12][13][14], which is known to display a higher-frequency resonance compared to CPR. Thus far, all the theoretical works focused on laser diodes (LDs) have reported that PPR phenomena appear with the existence of an additional oscillation path, besides the main oscillation path, in an LD cavity [15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

The Proposal of a Photon–Photon Resonance Control Scheme by Using an Active MMI Laser Diode

Xiao,

Kawano,

Jiang

et al. 2023

Photonics

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The modulation bandwidth in the direct modulation of a laser diode is limited by relaxation oscillation. To achieve an even higher frequency response, photon–photon resonance has been investigated to extend this modulation bandwidth. Thus far, several reports have demonstrated a higher modulation performance being achieved when utilizing PPR; however, to our knowledge, the PPR control scheme has not been comprehensively discussed. In this paper, we discuss the theory of PPR in regard to the PPR frequency, intensity, and width control scheme. We propose to utilize waveguide configuration, specifically an active multimode interferometer, for optimization. The simulation results offer an approximately 8 GHz improvement in the frequency response.

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“…To extend the speed of the DML, lots of research has been done. [10][11][12][13][14][15][16][17][18][19] Exploitation of photon-photon resonance (PPR) [20][21][22][23][24][25][26] enabled the possibility of much higher direct modulation bandwidth regardless of the relaxation oscillation resonance. To solve the damping issue at high frequency in frequency response, the introduction of multiple PPRs has been proposed and demonstrated by using an active multimode interferometer laser diode (active-MMI LD).…”

Section: Introductionmentioning

confidence: 99%

“…As the pre-condition of multiple PPR presence lies on the existence of complex cavities inside the laser diode, active-MMI LD is the ideal structure to introduce multiple PPRs. The PPR frequency itself is, however, extremely sensitive to the cleaving position [20][21][22][23][24] on other types of devices, which is difficult to control precisely. While an active-MMI structure has the benefit of non-sensitivity against the cleaving position.…”

Section: Introductionmentioning

confidence: 99%

A space mode selective light source with over 40 GHz direct modulation bandwidth

Hong

Mori

Murakami

et al. 2019

Jpn. J. Appl. Phys.

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A high-speed mode selective light source with over 40 GHz direct modulation bandwidth on both 0th and 1st order modes was demonstrated on an active multimode interferometer laser diode (active-MMI LD). By introducing multiple photon-photon resonances (PPR), the bandwidth of small signal frequency response is extremely extended. As the advantage of the active-MMI, the designed PPR frequencies are stable and do not change as the cleaving condition changes. In this work, 1 × 3 asymmetric active-MMI LD was fabricated to introduce multiple PPRs. Over 40 GHz direct modulation bandwidth has been confirmed experimentally on both 0th and 1st order modes.

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Low-chirp and enhanced-resonant frequency by direct push-pull modulation of DFB lasers

Cited by 24 publications

References 23 publications

Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers

Enhanced Modulation Bandwidth by Delayed Push–Pull Modulated DFB Lasers

The Proposal of a Photon–Photon Resonance Control Scheme by Using an Active MMI Laser Diode

A space mode selective light source with over 40 GHz direct modulation bandwidth

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