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Optical Amplification at 1.5 µm in ErIII Coordination Polymer‐Doped Waveguides Based on Intramolecular Energy Transfer
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Optical Amplification at 1.5 µm in ErIII Coordination Polymer‐Doped Waveguides Based on Intramolecular Energy Transfer
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Journal Article
Optical Amplification at 1.5 µm in ErIII Coordination Polymer‐Doped Waveguides Based on Intramolecular Energy Transfer
2024
Overview
9,9‐bis (diphenylphosphorylphenyl) fluorene (FDPO) and dibenzotetrathienoacene (DBTTA), are synthesized as the neutral and anionic ligands, respectively, to prepare the ErIII coordination polymer [Er(DBTTA)3(FDPO)]n. Based on the intramolecular energy transfer, optical gains at 1.5 µm are demonstrated in [Er(DBTTA)3(FDPO)]n‐doped polymer waveguides under excitations of low‐power light‐emitting diodes (LEDs) instead of laser pumping. A ligand‐sensitization scheme between organic ligands and Er3+ ions under an excitation of an ultraviolet (UV) LED is established. Relative gains of 10.5 and 8.5 dB cm−1 are achieved at 1.53 and 1.55 µm, respectively, on a 1‐cm‐long SU‐8 channel waveguide with a cross‐section of 2 × 3 µm2 and a 1.5‐µm‐thick [Er(DBTTA)3(FDPO)]n‐doped polymethylmethacrylate (PMMA) as upper cladding. The ErIII coordination polymer [Er(DBTTA)3(FDPO)]n can be conveniently integrated with various low‐loss inorganic waveguides to compensate for optical losses in the C‐band window. Moreover, by relying on the intramolecular energy transfer and UV LED top‐pumping technology, it is easy to achieve coupling packaging of erbium‐doped waveguide amplifiers (EDWAs) with pump sources in planar photonic integrated chips, effectively reducing the commercial costs. Based on the intramolecular energy transfer, relative gains of 10.5 and 8.5 dB cm−1 at 1535 and 1550 nm respectively are demonstrated in ErIII coordination polymer [Er(DBTTA)3(FDPO)]n‐doped waveguides under excitations of light‐emitting diode instead of laser pumping. This study is expected to achieve the application of polymer waveguide amplifiers in planar photonic integration and facilitate low‐cost packaging of the waveguide and pump sources.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
