Programmable on-chip photonic signal processor based on a microdisk resonator array

Transcription

1 Programmable on-chip photonic signal processor based on a microdisk resonator array Weifeng Zhang and Jianping Yao Microwave Photonics Research Laboratory School of Electrical Engineering and Computer Science University of Ottawa MWP8, Oct. -5, 8 Toulouse, France

2 Introduction A field-programmable gate array (FPGA) is an electronic integrated circuit designed to be configured by a customer after being manufactured.

3 Introduction Can we have a photonic FPGA?

4 Introduction - Programmable photonic signal processors Rectangular cell Basic circuit components FIR filter L. Zhuang, C. Roeloffzen, M. Hoekman, K. Boller, A. Lowery, Optica, (5). IIR filter 4

5 Bar (switch) Coupler Notch filter Hilbert transformer Bandpass filter Delay line π 5

6 6

7 Introduction - Programmable photonic signal processors Hexagonal cell D. Pérez, I. Gasulla, L. Crudgington, D. Thomson, A. Khokhar, K. Li, W. Cao, G. Mashanovich and J. Capmany, Nature Commun., 8, 66 (7). 7

8 Introduction - Programmable photonic signal processors 8

9 Introduction - Programmable photonic signal processors tap FIR filter tap FIR filter tap FIR filter 9

10 Introduction The architectures reported in the two previous papers has large size and high power consumption small-scale integration less flexibility in reconfigurability Solution: to change the rectangular or hexagonal cells to microdisk cells.

11 A disk-based large scale photonic FPGA (a) A A Silica Silicon 9 Unit: nm Wire Waveguide Micro-disk waveguide crossing resonator Metallic line Metallic micro-heater Rib waveguide Via Slab waveguide Electrode Thermal resistor 8 x 8 disk mesh network Much smaller size

12 Operation signal routing Input optical signal λο λο λ λ Disk λο = λ λ Disk λ Disk 4 λ 4 Disk λο = λ λ Disk 4 Disk λο = λ = λ Disk Disk 4 Disk 4 Disk

13 Fabricated device Waveguide crossing Micro-heater Disk Slab waveguide 8 x 8 disk mesh network Opt. Express, ()

14 Measurements λ 4 4 Disk Port (d) (e) Heater Power (mw) (j) (k) (i) Disk is tuned λ (c) Disk -5 Disk is tuned Static State (f) Heater Power (mw) (g) (h) Measured by Luna OVA 4

15 Measurements (a) (c) (b) (d)

16 Measurements

17 Delay-line demonstration An on-chip tunable optical delay line based on 8 cascaded MDRs in all-pass filter configuration Group delay (ps) (a) (b) Fitted Measured Fitted Measured Fitted Measured Fitted Measured Heater Power (mw) Heater Power (mw)

18 Discussion: as a flat-top bandpass optical filter Optical power wavelength (nm)

19 Discussion: as a multichannel differentiator - WDM systems 4 ( ) y t dx() t = dt π j e ω ω ω > ω = j( ) = π j e ω ω ω < ω H( jω) ω ω Magnitude (a) 8-Channnel Differentiator M. Li, D. Janner, J. P. Yao, and V. Pruneri, Opt. Express, vol. 7, no., pp , Oct. 9. Phase ( π rad) (b) Magnitude and phase response of a differentiator. 9

20 Discussion: as an optical beamforming network

21 Discussion: as a delay line FIR filter

22 Conclusion A programmable photonic signal processor based on a silicon photonic microdisk array can be flexibly reconfigured and have a smaller size suitable for large scale integration. The processor can be reconfigured to achieve diverse signal processing functions including time delay, temporal differentiation, true time delay beamforming, and microwave delay line filtering an optical FPGA. CMC Microsystems NSERC Si-EPIC program

23 Thank you and welcome to MWP9 in Ottawa