Abstract
This paper presents an optimized asymmetric three corrugation-pitch-modulated DFB laser (3CPM-DFB) with extremely high mode selectivity(△αL= 0.97) and low flatness(F = 0.009), which are two key parameters to indicate the laser’s single longitudinal mode(SLM) performance. In threshold analysis, the optimization process based on transfer matrix method is demonstrated to maximize △αL and minimize F simultaneously. In the above-threshold regime, the evolutions of △αL and longitudinal distribution of photon density with injection current are evaluated. More importantly, nanoimprint lithography which was proved an efficient way to fabricate DFB gratings can provide completely same simple fabrication procedure for both 3CPM grating and conventional uniform grating. So the big practical value of 3CPM-DFB can be expected because of its advanced performance and easy manufacturability.
Highlights
With the development requirements of metro and access networks, low cost and high stable single longitudinal mode (SLM) oscillation DFB lasers are desired strongly[1]
This paper presents an optimized asymmetric three corrugation-pitch-modulated DFB laser (3CPM-DFB) with extremely high mode selectivity( L = 0.97) and low flatness(F = 0.009), which are two key parameters to indicate the laser’s single longitudinal mode(SLM) performance
To avoid the degradation of SLM operation of conventional quarterly-wavelength shifted (QWS) grating DFB laser induced by spatial hole burning (SHB) effect, there is a long research history of grating optimization design
Summary
With the development requirements of metro and access networks, low cost and high stable single longitudinal mode (SLM) oscillation DFB lasers are desired strongly[1]. The diffraction grating structure is one of the key parts deciding the laser’s SLM performance, which usually indicated by two parameters: mode selectivity ( L ) and cavity field flatness factor (F). To avoid the degradation of SLM operation of conventional quarterly-wavelength shifted (QWS) grating DFB laser induced by spatial hole burning (SHB) effect, there is a long research history of grating optimization design. They are classified into four categories:(1)gain coupling grating[2]; (2)distributed coupling coefficient (DCC) grating[3]; (3)corrugation pitch modulated (CPM) grating[4]; (4) multiple phase-shift (MPS) grating[5]. W Active layer thickness, d Cavity length, L Optical confinement factor, Г Grating period, Λ
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