@article{3193774,
    title = "Multi-Rate and Multi-Channel Optical Equalizer Based on Photonic
Integration",
    author = "Kouloumentas, Christos and Tsokos, Christos and Groumas, Panos and and Gounaridis, Lefteris and Raptakis, Adam and Mylonas, Elias and and Andrianopoulos, Efstathios and Worhoff, Kerstin and Lawniczuk, Katarzyna and and Leinse, Arne and Avramopoulos, Hercules",
    journal = "IEEE Photonics Technology Letters",
    year = "2020",
    volume = "32",
    number = "23",
    pages = "1465-1468",
    publisher = "IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC",
    issn = "1041-1135",
    doi = "10.1109/LPT.2020.3035506",
    keywords = "Optical equalizer; optical FIR filter; micro-ring resonators; optical
interconnects; PIC technology; silicon nitride",
    abstract = "We propose and experimentally demonstrate a photonic integrated circuit
(PIC) that operates as an optical equalizer (OE) with multi-rate and
multi-channel capability. The OE has the structure of a 3-tap direct
form finite impulse response (FIR) filter and is based on the use of
micro-ring resonators (MRRs) for the tuning of its delay lines. The PIC
is fabricated on TriPleX platform and has 17 reconfigurable elements in
total including nine MRRs, five optical couplers and three standalone
phase shifters. Using this OE in an on-off keying system with bandwidth
limitations we achieve an eye-diagram opening improvement more than 14
dB working with signals at 4.67 and 5.84 Gbaud both in single- and
dual-channel operation. Extension to higher modulation formats is
direct. Extension to higher symbol rates is also possible via the use of
smaller MRRs."
}