Photonic integrated technology for multi-wavelength laser emission

Abstract

We summarized the design, fabrication challenges and important technologies for multi-wavelength laser transmitting photonic integration. Technologies discussed include multi-wavelength laser arrays, monolithic integration and modularizing coupling and packaging. Fabrication technique requirements have significantly declined with the rise of reconstruction-equivalent-chirp and second nanoimprint mask technologies. The monolithic integration problem between active and passive waveguides can be overcome with Butt-joint and InP array waveguide grating technologies. The dynamic characteristics of multi-factors will be simultaneously measured with multi-port analyzing modules. The performance of photonic integration chips is significantly improved with the autoecious factors compensation packaging technique. photonic integration, laser, multi-wavelength Citation:Chen X F, Liu W, An J M, et al. Photonic integrated technology for multi-wavelength laser emission.

An asymmetric sampled Bragg grating structure for improving semiconductor laser efficiency

“…In this paper, the NTGs of the asymmetric lasers with different B γ , which is range from 0.2 to 0.8, are investigated. Figure 5 shows the relation between NTG and B γ , in which it can be seen with the increase of 0 When A γ keeps constant, according to (2), for B γ being γ or 1-γ the reflectivity to the lasing wavelength is equivalent;…”

“…According to (2), when L R γ γ ≠ , in the left and right sections, to the ±1st order channel Bragg wavelength the reflectivity is different. Given one of the ±1st order channels being selected as the lasing channel, for such an asymmetric SBG semiconductor laser with π EPS, it is apparent that under the same injection current the output power from the laser's two end-facets are different.…”

“…Being large transmission capacity and low energy consumption, photonic integrated circuits (PICs) have attracted interest increasingly in future optical networks [1,2]. Generally, in order to improve the output efficiency of a DFB semiconductor laser, coating its one end-facet with high-reflection (HR) coating and the other end-facet with antireflection (AR) coating is a good method.…”

Longitudinal spatial hole burning, its impact on laser operation, and suppression

“…For directly modulated DFB lasers, any external feedback (from, e.g., the fiber-pigtail, or splitter/combiner, or filter, or wavelength multiplexer/demultiplexer) may lead to the lasing wavelength shift, or optical power fluctuation, or even coherent collapse, and lasing termination. Although an optical isolator can be co-packaged with the DFB laser to solve this problem, it is certainly not cost-effective.Chen's group has been working on the sampled gratingbased DFB lasers and has made many significant contributions on multiple wavelength laser sources and tunable laser sources [7,8]. Their recent work on LSHB suppression by introducing a pair of phase shifts in the basic sampled grating DFB structure [9] has shed light on solving the aforementioned issue through a viable approach.…”

“…Chen's group has been working on the sampled gratingbased DFB lasers and has made many significant contributions on multiple wavelength laser sources and tunable laser sources [7,8]. Their recent work on LSHB suppression by introducing a pair of phase shifts in the basic sampled grating DFB structure [9] has shed light on solving the aforementioned issue through a viable approach.…”