2021
DOI: 10.1109/lpt.2020.3044262
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Ultra-Broadband Interleaver for Extreme Wavelength Scaling in Silicon Photonic Links

Abstract: We demonstrate an ultra-broadband silicon photonic interleaver capable of interleaving and de-interleaving frequency comb lines over a 125 nm bandwidth in the extended Cand L-bands. We use a ring-assisted asymmetric Mach Zehnder interferometer to achieve a flat-top passband response while maintaining a compact device footprint. The device has a 400 GHz free spectral range to divide an optical frequency comb with 200 GHz channel spacing into two output groups, each with a channel spacing of 400 GHz, yielding a … Show more

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Cited by 23 publications
(13 citation statements)
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“…Ultrabroadband light sources that emit over an extremely wide spectral range are of great interest in many fields, such as photonics, medical treatment, high-capacity optical data communications, ultraprecision metrology, and spectroscopy 1 7 . Conventionally, halogen tungsten lamps (HTLs) are used in most studies and applications, but they generate large amounts of heat and have limited operational lifetimes 8 .…”
Section: Introductionmentioning
confidence: 99%
“…Ultrabroadband light sources that emit over an extremely wide spectral range are of great interest in many fields, such as photonics, medical treatment, high-capacity optical data communications, ultraprecision metrology, and spectroscopy 1 7 . Conventionally, halogen tungsten lamps (HTLs) are used in most studies and applications, but they generate large amounts of heat and have limited operational lifetimes 8 .…”
Section: Introductionmentioning
confidence: 99%
“…Mach Zehnderbased wavelength filters have a pass-band roll-off proportional to their FSR, and thus the large FSR required for band interleaving (at least half of the total comb bandwidth) leads to unfeasible roll-off. Even for modified MZI designs targeted at flattening the pass-bands and sharpening the roll-off (such as ring-assisted MZIs [45], [46] and cascaded MZI lattices [47]), the demonstrated roll-off for large FSRs is still insufficient and would lead to severe crosstalk near the band transition. Onchip dichroic filters have been demonstrated as a candidate for similar filtering applications [48], but similarly have poor rolloff (2.82 dB/nm), insufficient crosstalk suppression (< 10 dB), and lack tunability to correct for fabrication imperfections and temperature swings.…”
Section: B Band Interleavingmentioning
confidence: 99%
“…Often, this bandwidth can be greater than 100 nm and thus places considerable strain on the devices, which are often highly wavelength-dependent for standard designs. To accommodate combs with > 100 channels at 100 GHz spacing, we demonstrate an ultra-broadband silicon photonic interleaver capable of interleaving and deinterleaving frequency comb lines over a 125 nm bandwidth from 1525-1650 nm, spanning the full C-and L-bands and representing the broadest operational bandwidth to date for an on-chip interleaver [45]. The device consists of a ringassisted Mach Zehnder interferometer (RMZI) with broadband coupling to the ring and broadband mutli-mode interference (MMI) splitter/combiners, enabling consistent performance over the full bandwidth of interest.…”
Section: A Ultra-broadband Performancementioning
confidence: 99%
“…1 [6], [7]. Within this architecture, there is a practical limit to the number of MRRs that can be cascaded onto a single bus waveguide due to crosstalk (XT), off resonance insertion loss (IL), and free spectral range (FSR) limitation due to finite bend radius, [24]- [27]. Fig.…”
Section: Introductionmentioning
confidence: 99%
“…Schematic of the heterogeneous III-V/Si DWDM 40 channel transceiver with integrated OFC, MOSCAP (de-) interleavers, MRRs, SOAs, and PDs. [7] 2 > REPLACE THIS LINE WITH YOUR MANUSCRIPT ID NUMBER (DOUBLE-CLICK HERE TO EDIT) < On-chip wavelength (de-)interleavers solve this problem by spatially dividing even and odd numbered OFC frequencies onto separate waveguides [16], [27], [28]. For our architecture, each waveguide will have a half number (10) of the total MRR count (20), but with the channel spacing doubled.…”
Section: Introductionmentioning
confidence: 99%