High-performance on-chip autocorrelator using a rib waveguide loaded with two-photon absorption diodes

Keisuke Kondo; Toshihiko Baba

doi:10.1364/OL.43.000719

Optics Letters
Vol. 43,
Issue 4,
pp. 719-722
(2018)
•https://doi.org/10.1364/OL.43.000719

High-performance on-chip autocorrelator using a rib waveguide loaded with two-photon absorption diodes

Keisuke Kondo and Toshihiko Baba

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Keisuke Kondo and Toshihiko Baba, "High-performance on-chip autocorrelator using a rib waveguide loaded with two-photon absorption diodes," Opt. Lett. 43, 719-722 (2018)

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Abstract

We report an on-chip autocorrelator comprising a Si rib waveguide and two-photon-absorption photodiodes in which two pulses simultaneously propagate in opposite directions, and their correlation is acquired. The rib waveguide’s broadband guiding mode and moderately low group index allow the device to operate over a wide wavelength range with high resolution. We confirm that the waveguide has a transmission band of at least 1300–1630 nm and observed correlation waveforms for pulses of the order of several hundred femtoseconds to several picoseconds, with a range of at least the entire C band region.

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Device	Type	Wavelength Range [nm]	Resolution [fs]	Detection Limit ${(P_{pk} P_{av})}_{\min}$ [ $W^{2}$ ]	Scale
Commercial [20]	Delay scan	410–1800	$< 5$	$10^{- 7}$	Bulky
Commercial [21]	Single shot	400–2000	$< 5$	$> 5$ ^a	Bulky
Scanning mirror and Si waveguide PD [2]	Delay scan	1100–2200 (Prediction)	$\sim 50$	$1 \times 10^{- 6}$	Bulky
Scanning mirror and Si waveguide PD [22]	Delay scan	1500–1600 (Calculation)	N/A	$2 \times 10^{- 10}$ (Calculation)	Bulky
Photonic crystal fiber and CCD camera [11]	Single shot	830 (Center wavelength)	N/A	0.02 ^a	Bulky
SHG crystal and CMOS camera [12]	Single shot	1053 (Center wavelength)	$\sim 25$	$> 0.3$ ^a	Bulky
PCW delay scanner and PCW PD [13]	Delay scan	1545–1555 (Prediction)	N/A	$2 \times 10^{- 5}$	Chip size
Nano wire and CCD camera [14]	Single shot	1064–1550	N/A	320 ^a	Bulky
PCW and CCD camera [15]	Single shot	1550–1565	53	$10^{- 7} - 10^{- 6}$ (Prediction)	Bulky
PCW with PD array [16]	Single shot	1520–1545	570	$10^{- 7} - 10^{- 6}$	Chip size
Rib waveguide with PD array (this work)	Single shot	1300–1630	57	$10^{- 6} - 10^{- 4}$	Chip size

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