Open AccessLow‐cost coaxial DFB LD transmitter optical subassembly for 25 Gb/s NRZ and 50 Gb/s PAM‐4 transmissions
Author(s) -
Jou JauJi,
Shih TienTsorng,
Su ZheXian,
Liao ChuanYu,
Wang Wei
Publication year - 2018
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2018.0027
Subject(s) - transmitter , physics , optics , bit error rate , coaxial , bandwidth (computing) , laser diode , distributed feedback laser , laser , electrical engineering , telecommunications , computer science , engineering , channel (broadcasting)
Here, a directly modulated coaxial distributed feedback (DFB) laser diode (LD) transmitter optical subassembly (TOSA) module is proposed for 25 Gb/s non‐return‐to‐zero (NRZ) and 50 Gb/s four‐level pulse amplitude modulation (PAM‐4) transmissions. A low‐cost TO‐56 header was used in the DFB LD TOSA package. The high‐frequency performance of the coaxial 1310 nm DFB LD TOSA module was simulated and analysed. The simulated frequency response can correspond with the measured result, and the 3 dB bandwidth was 19 GHz. In the back‐to‐back and 10 km signal mode fibre transmissions, 25 Gb/s NRZ and 50 Gb/s PAM‐4 eye diagrams of the DFB LD TOSA were measured. Clear 25 Gb/s NRZ and 50 Gb/s PAM‐4 eye openings can be observed. For 25 Gb/s NRZ transmissions, the received sensitivity was −11.8 dBm under a bit error rate (BER) of 10 −12 . For 50 Gb/s PAM‐4 transmissions, the BER was estimated to be below the forward error correction threshold. The low‐cost coaxial DFB LD TOSA is suitable in 100, 200, and 400 Gb/s transmissions.