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Our 3 mm MZMs have customized slabs with a reduced etch depth to improve their radiation hardness. Our current MZMs feature a Vπ∙L of 4.6 V∙cm and an insertion loss of 4.84 dB. Additionally, an error-free transmission was achieved successfully at a speed of 11.3 Gb/s while driving the modulators with a PRBS-7 signal and an amplitude of less than 2 Vpp. The Echelle grating (de-)multiplexers were designed and simulated numerically. The presented 1x7 device is compact and low-loss: the on-chip footprint is 680 μm × 380 μm, the channel spacing is 800 GHz, and the measured average insertion loss and crosstalk are 2.5 dB and -22 dB, respectively. With optimized components, higher bandwidth systems with more channels are achievable. |
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