Abstract
We experimentally investigated and demonstrated an ultralow noise hybrid amplifier that combines second-order distributed Raman amplifier (DRA) and first-order lumped Raman amplifier (LRA) in a cascaded approach. This approach allows for the reutilization of pump light from the LRA as the seed light in the second-order DRA, and simultaneous full-band dispersion compensation is realized by using dispersion compensation fiber in the LRA. This approach also supports broadband gain flattening based on the separated DRA and LRA configuration. The transmission application of the proposed amplifier was investigated using a set of 10 external cavity lasers (ECLs) in the C-band and 8 ECLs in the L-band. Ranging from 1531.12 nm to 1595.49 nm across C + L band, the proposed hybrid amplifier gives a maximum on-off gain of 27.2 dB and an average gain of 23.4 dB, with an extremely low effective noise figure (NF) of lower than -2.9 dB. Intensity modulation direct detection (IMDD) signal transmission is carried out at two different data rates across these 18 wavelengths in the C + L band: (1) 56 Gbps/λ PAM-4 signal; (2) 112 Gbps/λ PAM-4 signal. The results show that the error free transmissions are demonstrated over 101.6 km EX2000 fiber using both signals with 7% HD-FEC and 20% SD-FEC, respectively.
Original language | English |
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Pages (from-to) | 35777-35785 |
Number of pages | 9 |
Journal | Optics Express |
Volume | 31 |
Issue number | 22 |
Early online date | 10 Oct 2023 |
DOIs | |
Publication status | Published - 23 Oct 2023 |
Bibliographical note
© 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing AgreementFunding: National Natural Science Foundation of China (61935011, 62122047); National Key Research and
Development Program of China (2018YFB1801804)
Keywords
- Atomic and Molecular Physics, and Optics