Weiqiang Wang, Wenfu Zhang, Zhizhou Lu, Sai T. Chu, Brent E. Little, Qinghua Yang, Lei Wang, Wei Zhao. Self-locked orthogonal polarized dual comb in a microresonator[J]. Photonics Research, 2018, 6(5): 363
- Photonics Research
- Vol. 6, Issue 5, 363 (2018)
Fig. 1. Device schematic. (a) Schematic of the four-port high-Q MRR. The waveguide core is high-index doped silica glass, which is surrounded by SiO 2 2 μm × 3 μm
Fig. 2. Experimental measurement of the device characteristics. (a) Experimental setup for the measurement. The ECDL is a commercial tunable laser with linewidth of 100 kHz. The wavelength is swept from 1520 to 1600 nm in our measurements. The FRR comprises an optical coupler with splitting ratio of 99:1 and a segment fiber with length of ∼ 6 m Q 1.69 × 10 6 2.05 × 10 6
Fig. 3. Schematic of the orthogonal polarized dual-comb generation experiment. EDFA, erbium-doped fiber amplifier; ISO, isolator; PC, polarization controller; MRR, micro-ring resonator; TBPF, tunable bandpass filter; OC, optical coupler; PBS, polarization beam splitter; TE, transverse electric; TM, transverse magnetic.
Fig. 4. Experimental results of the orthogonal polarized dual comb. (a) Optical spectrum of the orthogonal polarized dual comb with over 300 nm bandwidth. The two pumps are located at around 1558 nm. (b)–(d) Enlarged drawing of the orthogonal dual comb at around wavelengths 1530, 1558, and 1590 nm, respectively. (e), (f) The optical spectra of separated TM- and TE-polarized combs.
Fig. 5. Beating RF spectra of comb line pairs located at around 1558.8, 1567.7, 1576.7, 1585.7, and 1594. 9 nm.
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