Session Index

Four-channel 20-nm-spaced WDM (de)multiplexer based on fabrication-tolerant
cascaded Mach-Zehnder interferometer configuration is demonstrated. Such unique device
design greatly reduces the process-induced spectral shift from 15 nm to <1 nm, verifying the
efficacy of the proposed design methodology for practical WDM applications.

 

Our recent research progresses on the integrated technologies and applications of microwave photonics and silicon photonics will be reviewed, including the development of new photonic components/modules as well as system applications.

 

The reflectivity of fiber Bragg gratings with two-grating sections, consisting of two grating periods, is simulated. When the difference of two gratings periods is 0.000014μm, the reflectivity spectrum of FBGs presents similarity of the reflectivity of two single-gratings FBGs except for the phase shift phenomenon.

 

By engineering the adiabaticity distribution using a single control parameter, we obtain shortcuts to adiabaticity (STA) in optical waveguides for multimode systems. The strategy is applied to the design of a polarization-independent 3-dB coupler based on silicon. The coupler has high tolerance to fabrication errors and an ultra-broad bandwidth.

 

Due to the huge demand of Internet of Things (IOT) and cloud service, the transmission capacity inside the data center is highly required. The 100Gb/s transmission is deployed widely and the 400Gb/s transmission is growing inside the data center. Moreover, the solution of 800Gb/s transmission is discussing now. To achieve the bandwidth requirement, a novel transmission structure of four wavelengths (λ) by four single mode fibers (SMF) is proposed and the aggregated transmission capacity is up to 1.6Tb/s to satisfy the bandwidth demand of data center in the next decade. To realize this novel idea, the silicon photonics technology is the best candidate due to the advantage of integration. In this presentation, a silicon photonics transmitting (Tx) chip by integrated more than forty devices is designed. Total sixteen optimized Mach-Zenhder Modulators (MZM) are built and a special 4x16 Array Waveguide (AWG) Optical Multiplexer is included in the Tx chip. External high power DFB laser diodes are packaged by the edge to inject the light into the Tx chip. The total optical loss is around 30dB which will be improved by a further process and structure optimization. A single MZM is tested to demonstrate the 100Gb/s PAM4 transmission. In the receiving side, sixteen Ge photodiodes is integrated on the silicon photonics receiving chip. At the end of four 1x4 AWG optical De-multiplexers. A 50GHz bandwidth of the Ge photodiode is measured to ensure the 100Gb/s PAM4 receiving. In general, the feasibility of this novel 4λ x 4 SMF transmission structure and the possibility of this Tx optical engine and Rx optical engine are shown and will be a potential candidate in the future data center in the next decade.

 

A miniaturized mmWave fiber-wireless phased array antenna implemented by heterogeneous integration of Si photonics, CMOS RF circuits and patch antenna array is presented for 5G mobile communication. We demonstrate a 28-GHz, 16-QAM OFDM signal transmitted through this module with EVM 9.52%.