Abstract
An AXEL sub-assembly and a 4-channel AXEL TOSA were designed and fabricated. The sub-assembly with a width of less than 0.65 mm was needed to make the width of TOSA applicable to QSFP-DD transceiver. On the other hand, the wire that connects between the terminator and the DC block capacitor must be 0.5 mm or longer to obtain 3-dB bandwidth of over 40 GHz which is enough for 50-Gbaud operation. To become that wire length 0.5 mm or more on the narrow sub-assembly, the AXEL chip was placed between the RF circuit board integrated with the terminator and the DC block capacitor. As a result, the AXEL sub-assembly with a width of only 0.65 mm and with a 3-dB bandwidth of more than 40 GHz was realized. Based on the designed sub-assembly, the 4-channel AXEL TOSA was fabricated. Size of the TOSA is only 18.2 × 6.2 × 5.4 mm (which is suitable for a QSFP-DD transceiver). Optical-modulation amplitudes (OMAs) of the fabricated TOSA exceed +4.7 dBm for all channels. 40-km SMF fiber-amplifier-less transmission of 4-channel × 100-Gbit/s/λ signals was successfully demonstrated by using the fabricated 4-channel AXEL TOSA, 4-channel APD ROSA, and a commercially available DSP. Loss budgets exceed 18 dB for all channels.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription