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High channel count and high precision channel spacing multi-wavelength laser array for future PICs.

Shi Y, Li S, Chen X, Li L, Li J, Zhang T, Zheng J, Zhang Y, Tang S, Hou L, Marsh JH, Qiu B - Sci Rep (2014)

Bottom Line: In spite of their tremendous potential, adoption of the MLA has been hampered by a number of issues, particularly wavelength precision and fabrication cost.In this paper, we report high channel count MLAs in which the wavelengths of each channel can be determined precisely through low-cost standard μm-level photolithography/holographic lithography and the reconstruction-equivalent-chirp (REC) technique. 60-wavelength MLAs with good wavelength spacing uniformity have been demonstrated experimentally, in which nearly 83% lasers are within a wavelength deviation of ±0.20 nm, corresponding to a tolerance of ±0.032 nm in the period pitch.As a result of employing the equivalent phase shift technique, the single longitudinal mode (SLM) yield is nearly 100%, while the theoretical yield of standard DFB lasers is only around 33.3%.

View Article: PubMed Central - PubMed

Affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China.

ABSTRACT
Multi-wavelength semiconductor laser arrays (MLAs) have wide applications in wavelength multiplexing division (WDM) networks. In spite of their tremendous potential, adoption of the MLA has been hampered by a number of issues, particularly wavelength precision and fabrication cost. In this paper, we report high channel count MLAs in which the wavelengths of each channel can be determined precisely through low-cost standard μm-level photolithography/holographic lithography and the reconstruction-equivalent-chirp (REC) technique. 60-wavelength MLAs with good wavelength spacing uniformity have been demonstrated experimentally, in which nearly 83% lasers are within a wavelength deviation of ±0.20 nm, corresponding to a tolerance of ±0.032 nm in the period pitch. As a result of employing the equivalent phase shift technique, the single longitudinal mode (SLM) yield is nearly 100%, while the theoretical yield of standard DFB lasers is only around 33.3%.

No MeSH data available.


Schematic illustration of the wave-vector conversion of REC technique.The sampling pattern provides an additional wave-vector Ks(z) to form a new wave-vector of Kg(z) to manipulate the light behavior in a waveguide with uniform seed (basic) grating wave-vector of K0. Through this vector conversion, complex nanometer grating structures can be equivalently realized by µm-level structures.
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f1: Schematic illustration of the wave-vector conversion of REC technique.The sampling pattern provides an additional wave-vector Ks(z) to form a new wave-vector of Kg(z) to manipulate the light behavior in a waveguide with uniform seed (basic) grating wave-vector of K0. Through this vector conversion, complex nanometer grating structures can be equivalently realized by µm-level structures.

Mentions: As illustrated in Fig. 1, an additional wave-vector Ks(z), resulting from the large scale sampling pattern, is introduced artificially. Hence, the wave-vector of the sampled grating Kg(z) can be manipulated by altering the value of Ks(z). If the phase match condition between the light and Kg(z) is satisfied, the interaction takes place. As a consequence, the optical properties of the grating can be equivalently realized by designing a μm-scale sampling pattern, and the wavelength precision can be improved by a factor of mf'(z)/(P/Λ0+mf'(z))21112. Therefore, the fabrication tolerance can be relaxed and the fabrication cost can be dramatically reduced. This principle is very similar to quasi-phase matching (QPM) in nonlinear materials for high efficiency light wavelength conversion1314, where an artificial periodic structure with larger period is introduced to produce a desired phase matching condition. So the basic principle of the REC technique can be regarded as microstructure based QPM.


High channel count and high precision channel spacing multi-wavelength laser array for future PICs.

Shi Y, Li S, Chen X, Li L, Li J, Zhang T, Zheng J, Zhang Y, Tang S, Hou L, Marsh JH, Qiu B - Sci Rep (2014)

Schematic illustration of the wave-vector conversion of REC technique.The sampling pattern provides an additional wave-vector Ks(z) to form a new wave-vector of Kg(z) to manipulate the light behavior in a waveguide with uniform seed (basic) grating wave-vector of K0. Through this vector conversion, complex nanometer grating structures can be equivalently realized by µm-level structures.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4260219&req=5

f1: Schematic illustration of the wave-vector conversion of REC technique.The sampling pattern provides an additional wave-vector Ks(z) to form a new wave-vector of Kg(z) to manipulate the light behavior in a waveguide with uniform seed (basic) grating wave-vector of K0. Through this vector conversion, complex nanometer grating structures can be equivalently realized by µm-level structures.
Mentions: As illustrated in Fig. 1, an additional wave-vector Ks(z), resulting from the large scale sampling pattern, is introduced artificially. Hence, the wave-vector of the sampled grating Kg(z) can be manipulated by altering the value of Ks(z). If the phase match condition between the light and Kg(z) is satisfied, the interaction takes place. As a consequence, the optical properties of the grating can be equivalently realized by designing a μm-scale sampling pattern, and the wavelength precision can be improved by a factor of mf'(z)/(P/Λ0+mf'(z))21112. Therefore, the fabrication tolerance can be relaxed and the fabrication cost can be dramatically reduced. This principle is very similar to quasi-phase matching (QPM) in nonlinear materials for high efficiency light wavelength conversion1314, where an artificial periodic structure with larger period is introduced to produce a desired phase matching condition. So the basic principle of the REC technique can be regarded as microstructure based QPM.

Bottom Line: In spite of their tremendous potential, adoption of the MLA has been hampered by a number of issues, particularly wavelength precision and fabrication cost.In this paper, we report high channel count MLAs in which the wavelengths of each channel can be determined precisely through low-cost standard μm-level photolithography/holographic lithography and the reconstruction-equivalent-chirp (REC) technique. 60-wavelength MLAs with good wavelength spacing uniformity have been demonstrated experimentally, in which nearly 83% lasers are within a wavelength deviation of ±0.20 nm, corresponding to a tolerance of ±0.032 nm in the period pitch.As a result of employing the equivalent phase shift technique, the single longitudinal mode (SLM) yield is nearly 100%, while the theoretical yield of standard DFB lasers is only around 33.3%.

View Article: PubMed Central - PubMed

Affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China.

ABSTRACT
Multi-wavelength semiconductor laser arrays (MLAs) have wide applications in wavelength multiplexing division (WDM) networks. In spite of their tremendous potential, adoption of the MLA has been hampered by a number of issues, particularly wavelength precision and fabrication cost. In this paper, we report high channel count MLAs in which the wavelengths of each channel can be determined precisely through low-cost standard μm-level photolithography/holographic lithography and the reconstruction-equivalent-chirp (REC) technique. 60-wavelength MLAs with good wavelength spacing uniformity have been demonstrated experimentally, in which nearly 83% lasers are within a wavelength deviation of ±0.20 nm, corresponding to a tolerance of ±0.032 nm in the period pitch. As a result of employing the equivalent phase shift technique, the single longitudinal mode (SLM) yield is nearly 100%, while the theoretical yield of standard DFB lasers is only around 33.3%.

No MeSH data available.