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access icon free Low-cost coaxial DFB LD transmitter optical subassembly for 25 Gb/s NRZ and 50 Gb/s PAM-4 transmissions

© The Institution of Engineering and Technology
Received 11/02/2018, Accepted 25/04/2018, Revised 20/04/2018, Published 26/04/2018

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.

Inspec keywords: error statistics; forward error correction; optical transmitters; distributed feedback lasers; semiconductor lasers; frequency response; pulse amplitude modulation; optical fibre communication

Other keywords: signal mode fibre transmissions; TO-56 header; NRZ; bit rate 200 Gbit/s; bit rate 100 Gbit/s; distance 10 km; bandwidth 19 GHz; forward error correction; directly modulated DFB LD; high-frequency performance; bit rate 400 Gbit/s; bit rate 50 Gbit/s; wavelength 1310 nm; bit error rate; nonreturn-to-zero transmissions; frequency response; pulse amplitude modulation; TOSA module; PAM-4 transmissions; bit rate 25 Gbit/s; low-cost coaxial DFB LD transmitter optical subassembly

Subjects: Modulation and coding methods; Probability theory, stochastic processes, and statistics; Lasing action in semiconductors; Optical communication equipment; Semiconductor lasers; Codes; Optical communication devices, equipment and systems; Other topics in statistics

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