title: On-chip WDM mode-division multiplexing interconnection with optional demodulation function.
abstract: We propose and fabricate a wavelength-division-multiplexing (WDM) compatible and multi-functional mode-division-multiplexing (MDM) integrated circuit, which can perform the mode conversion and multiplexing for the incoming multipath WDM signals, avoiding the wavelength conflict. An phase-to-intensity demodulation function can be optionally applied within the circuit while performing the mode multiplexing. For demonstration, 4 × 10 Gb/s non-return-to-zero differential phase shift keying (NRZ-DPSK) signals are successfully processed, with open and clear eye diagrams. Measured bit error ratio (BER) results show less than 1 dB receive sensitivity variation for three modes and four wavelengths with demodulation. In the case without demodulation, the average power penalties at 4 wavelengths are -1.5, -3 and -3.5 dB for TE₀-TE₀, TE₀-TE₁ and TE₀-TE₂ mode conversions, respectively. The proposed flexible scheme can be used at the interface of long-haul and on-chip communication systems.
authors.forename: Mengyuan
authors.initials: M
authors.lastname: Ye
authors.forename: Yu
authors.initials: Y
authors.lastname: Yu
authors.forename: Guanyu
authors.initials: G
authors.lastname: Chen
authors.forename: Yuchan
authors.initials: Y
authors.lastname: Luo
authors.forename: Xinliang
authors.initials: X
authors.lastname: Zhang