Shengmeng Fu

30km Downstream Transmission Using 4×25Gb/s 4-PAM Modulation with Commercial 10Gbps TOSA and ROSA for 100Gb/s-PON

We proposed a novel 100Gb/s PON scheme using 4-PAM modulation with commercial low-cost 10Gbps TOSA/ROSA compatible with 40Gb/s TWDM-PON. Experimental results show that with EQ compensating bandwidth limitation and CD, 30km transmission is available.

Wavelength Locking of Silicon Photonics Multiplexer for DML-Based WDM Transmitter

We present a wavelength locking platform enabling the feedback control of silicon (Si) microring resonators (MRRs) for the realization of a 4 × 10 Gb/s wavelength-division-multiplexing (WDM) transmitter. Four thermally tunable Si MRRs are employed to multiplex the signals generated by four directly modulated lasers (DMLs) operating in the L-band, as well as to improve the quality of the DMLs signals. Feedback control is achieved through a field-programmable gate array controller by monitoring the working point of each MRR through a transparent detector integrated inside the resonator. The feedback system provides an MRR wavelength stability of about 4 pm (0.5 GHz) with a time response of 60 ms. Bit error rate (BER) measurements confirm the effectiveness and the robustness of the locking system to counteract sensitivity degradations due to thermal drifts, even under uncooled operation conditions for the Si chip.

Wavelength locking platform for DML-based multichannel transmitter on a silicon chip

We present a platform for the feedback control of a multichannel transmitter based on DML sources and a silicon photonic multiplexer and carver circuit. Automatic tuning and wavelength locking are demonstrated in about 150 ms.

High speed optical interconnects with PAM4 modulation for short-reach applications

Utilizing the advantages of less bandwidth requirement and chromatic dispersion penalty, PAM4 modulation has been discussed for Ethernet optical transceiver as well as passive optical network, including the low-cost 100GE 2km, 400GE 2km/10km/40km solutions and high-speed 25Gbps/40Gbps PON. Meanwhile, the system performance has also been evaluated experimentally.

84-Channel ultra-dense silicon photonics optical IO

An ultra-dense optical IO solution for silicon photonic chip is proposed, based on multi-core fiber array and three dimensional optical interposer. We demonstrate an 84-channel prototype with 3.5mm width on optical coupling interface.

25-Gb/s and 40-Gb/s Faster-than-Nyquist PON Based on Low-Cost 10G-Class Optics

We propose downstream transmission of 25-Gb/s and 40-Gb/s Faster-than-Nyquist signals based on NRZ and PAM4 for high-capacity PON using low-cost 10G optics, respectively achieving -23.9 dBm and -20 dBm receiver sensitivities after 20-km SSMF.

Narrow-linewidth widely tunable hybrid external cavity laser using Si 3 N 4 /SiO2 microring resonators

We report on the characteristics of a tunable hybrid external cavity laser using silicon nitride microring resonators. A wavelength tuning range covering from 1530nm to 1580nm is demonstrated with a side mode suppression ratio larger than 45dB. Typical linewidth values are 65kHz.

Automatic control of the silicon microring OSR and multiplexer in DML-based WDM transmitter for 40G TWDM-PON OLT

We present a control system for wavelength stabilization of silicon MRR used to improve ER in a four-channel DML-based transmitter. The ER enhancement is achieved with automatic control and the sensitivity of the system is better than -28 dBm at 10-3 BER after 40-km transmission.

Ultra-dense silicon photonics optical IO solution for optical chip scale package

Optical chip scale package is a key transceiver technology for future communication networks. A novel scheme is proposed with 336 electrical and optical channels integrated on single substrate. A novel ultra-dense optical IO solution for silicon photonics chips is proposed as an important enabling technology.

4×10 Gbit/s L-band WDM transmitter with automatic control of silicon photonic channel multiplexer and carver

We present an L-band WDM transmitter exploiting a feedback-controlled Si photonic circuit for channel multiplexing and extinction ratio enhancement of four DML sources. 4×10 Gbit/s transmission along a 50-km SMF is demonstrated.