| Autor: |
Romala Sattibabu, Pradip Kumar Dey, B.N. Shivakiran Bhaktha, Pranabendu Ganguly |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Results in Optics, Vol 8, Iss , Pp 100262- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2666-9501 |
| DOI: |
10.1016/j.rio.2022.100262 |
| Popis: |
Low-crosstalk zero-gap directional coupler (ZDC) based TE-TM polarization splitter/combiner was designed at 1.55 µm transmitting wavelength using titanium indiffused LiNbO3 technology and effective-index based matrix method (EIMM). Single mode waveguides and ZDC were designed from its fabrication parameters. The coupling length of ZDC was optimized to 1826 µm to achieve a splitter crosstalk around −60 dB for both polarizations. At input and output ends of ZDC low-loss cosine-generated S-bent waveguides were used. For proof-of-concept, the device was fabricated and tested. Details of fabrication technology of the device are discussed. DC sputtering process was adopted for titanium film deposition, and wet-oxygen ambient was used during high-temperature diffusion of titanium into LiNbO3 to suppress lithium out-diffusion. Our first experiment with the splitter yields crosstalk values −10.79 dB for TE and −10.21 dB for TM mode. The measured fiber-device total insertion losses were 3.13 dB and 5.15 dB for TE and TM polarizations. The higher crosstalk values of the fabricated polarization-splitter can be significantly lowered by using optical detector of higher efficiency, and coupling length compensation during mask-data generation. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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