Complete single mode wavelength coverage over 40 nm with a super structure grating DBR laser

Abstract

The spectral characteristics of a widely tunable super structure grating distributed Bragg reflector (SSG-DBR) laser are investigated and the design considerations of the grating reflectors are given. By systematically adjusting the control currents of the two reflector sections and the phase section it is experimentally shown that every wavelength in an interval of 40 nm can be reached with a side-mode suppression usually better than 30 dB.

Wavelength switching using multicavity semiconductorlaser diodes

“…In contrast to previous work (for example Ref. [4][5][6][7] wavelength selection is digital in nature and the use of Bragg grating defined wavelengths is intrinsically temperature insensitive.…”

Optically controlled serially fed phased-array transmitter

“…Because of the TTD in our system, the node position is independent of frequency. The power spectrum of the node is shown to be minimized over the bandwidth defined by the pulse (8)(9)(10)(11)(12). To further demonstrate the two antenna signals indeed cancel out, one antenna was disconnected from the system and the spectrum of the other antenna measured.…”

“…1 This network then feeds the parallel delays to the antenna arrays. In our design, the timing portion uses an electrically tuned DBR laser [10], [11]. The laser light output is both amplitude modulated at the desired microwave frequencies and gated at the RF transmission signal pulse length using an optical modulator.…”

Simple and compact V-cavity semiconductor laser with 50×100 GHz wavelength tuning

“…Widely wavelength tunable semiconductor lasers are indispensable in next-generation optical networks. A variety of tunable lasers have been developed such as sampled grating distributed Bragg reflector (SGDBR) lasers [1][2][3][4], superstructure grating (SSG) DBR laser [5][6][7], digital supermode (DS) DBR laser [8], modulated grating Y-branch laser [9], thermally tunable distributed feedback (DFB) laser arrays [10], and MEMS based external cavity lasers [11]. For SGDBR or DSDBR lasers, for example, excellent performance has been achieved including wide tuning range covering full C-or L-band with side-mode suppression ratio (SMSR) above 40 dB.…”