banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Distributed feedback transistor laser
Rent this article for
View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic diagram of a DFB TL with native oxide confinement and a surface grating over the active region having a width . The total device length is . (b) SEM image of the front facet of the device showing the edge oxide confinement layer (2) and the grating etched into the upper emitter AlGaAs cladding layer (1). The grating region is backfilled with benzocyclobutene (BCB) dielectric to facilitate emitter contact formation.

Image of FIG. 2.
FIG. 2.

Collector characteristics of the DFB TL of Fig. 1 ( emitter) operated at . Threshold occurs at base current and current gain , the compression typical of a TL. The inset plot of vs with collector-base bias shows a reduction in gain from 3.2 to 2.9 at threshold.

Image of FIG. 3.
FIG. 3.

Comparison of the CW operation optical emission intensity as a function of base current from a single-facet of the DFB-TL (black lines) and a FP TL (gray lines) operating at with . Bias points (a) and (b) correspond to the data of Fig. 4. The dotted lines are a plot of single-facet output slope efficiency for each device. Both devices have dimensions of .

Image of FIG. 4.
FIG. 4.

(a) CW operation recombination radiation spectra corresponding to the characteristics of the DFB-TL of Fig. 2 at a base current of and collector to emitter bias of . Plot (b) shows the multimode spectrum of the FP TL of Fig. 3 operated at and .

Image of FIG. 5.
FIG. 5.

CW stimulated emission spectra for various base bias currents (, 19, and 25 mA) above laser threshold for the DFB-TL of Fig. 2. The total wavelength shift in the peak output is 0.24 nm .


Article metrics loading...


Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Distributed feedback transistor laser