Analysis and testing of total ionizing dose effect on several commercial optical transceivers via gamma-ray radiation

In our Letter, we selected several commercial optical transceivers, which consist of single-channel transceiver modules, parallel transmitting and receiving modules, and Ethernet passive optical network(EPON) optical line terminal(OLT) and optical network unit(ONU) modules, to do the total ionizing dose(TID) testing via the gamma-ray radiation method. The changing of current and receiver sensitivity of optical transceivers is discussed and analyzed. Based on the TID testing exposed to a TID of 50 krad(Si) at a dose rate of about 0.1 rad(Si)/s,the performance of single-channel transceivers and parallel receiving modules has not changed after 50 krad(Si)exposure, the parallel transmitting and EPON ONU modules have not worked after 40 krad(Si) and 47 krad(Si)exposure, the EPON OLT module has bit error in the process of irradiation, and it can work well after annealing;the reason for the error of OLT is analyzed. Finally, based on the theoretical analysis and testing results, this Letter provides several design suggestions to improve the reliability for optical transceivers, which can be referenced by satellite system designation for various space missions.     

Remotely pumped EDFA-based 40-Gb/s downstream and 10-Gb/s upstream long-reach WDM PON employing RSOA and FBG equalizer

We propose a remotely pumped Er-doped fiber amplifier （EDFA）-based 40-Gb/s downstream and 10- Gb/s upstream transmission long-reach wavelength division multiplexing passive optical network （WDM- PON） scheme with downstream and upstream transmission implemented by quadrature phase-shift keying （QPSK） transceiver and reflective semiconductor optical amplifier （RSOA）-based intensity modulation direct detection （IM-DD）. Transmissions of the 40-Gb/s QPSK downstream, using a Mach-Zehnder mod- ulator, and the 10-Gb/s non-return-to-zero on-off keying （NRZ-OOK） upstream, using a 1.2-GHz RSOA equalized by fiber Bragg grating （FBG）, are demonstrated with 40-km fiber transmission.     

Fifty-five km reach,bidirectional, 400 Gb/s(40×10 Gb/s), channel-reuse DWDM–PON employing a self-wavelength managed tunable laser

We experimentally demonstrate a channel-reuse bidirectional 10 Gb∕s∕λ long-reach dense wavelength-division multiplexing passive optical network(DWDM-PON) and an optical beat-noise-based automatic wavelength control method for a tunable laser used in a colorless optical network unit(where λ· wavelength). A55 km, bidirectional, 400 Gb/s(40 × 10 Gb∕s) capacity channel-reuse transmission with 100 GHz channel spacing is achieved. The transmission performance is also measured with different optical signal to Rayleigh backscattering noise ratios and different central wavelength shifts between upstream and downstream in the channel-reuse system.