[1] [1] P. M. Mejias and R. M. Herrero, “Bistable fiber-optics interferonetric sensor,” Applied Optics, 1988, 27(5): 811-813.

[2] [2] S. H. Shehadeh, D. Steup, and J. Weinzierl, “Cascaded linear and nonlinear optical resonators: Towards a smart deflection sensor,” in Microsystems and Nanoelectronics Research Conference, Canada, Oct. 13-14, 2009.

[3] [3] P. Pakdeevanich and M. J. Adams, “Measurements and modeling of reflective bistability in 1.55-μm laser diode amplifiers,” IEEE Journal of Quantum Electronics, 1999, 35(12): 1894-1903.

[4] [4] N. F. Mitchell, J. O’Gorman, and J. Hegarty, “Optical bistability in asymmetric Fabry-Perot laser-diode amplifiers,” Optics Letters, 1994, 19(4): 269-271.

[5] [5] P. Wen, Michael S, M. Gross, and S. Esener, “Observation of bistability in vertical-cavity semiconductor optical amplifier (VCSOA),” Optics Express, 2002, 10(22): 1273-1278.

[6] [6] A. Hurtado, A. Gonzalez-Marcos, and J. A. Martin-Pereda, “Modeling reflective bistability in vertical-cavity semiconductor optical amplifiers,” IEEE Journal of Quantum Electronics, 2005, 41(3): 376-383.

[7] [7] C. F. Marki, D. R. Jorgesen, H. J. Zhang, P. Wen, and S. C. Esener, “Observation of counterclockwise, clockwise and butterfly bistability in 1550 nm VCSOAs,” Optics Express, 2007, 15(8): 4953-4959.

[8] [8] W. L. Zhang and S. F. Yu, “Bistabilities of birefringent vertical-cavity semiconductor optical amplifiers with antiresonant reflecting optical waveguide,” IEEE Journal of Quantum Electronics, 2010, 46(1): 11-18.