[1] Xu Nan, Liu Liren, Wan Lingyu, et al.. Coherent detection of position errors in space laser coherent communications [J]. Acta Optica Sinica, 2010, 30(2): 347-351.

[2] Yves Painchaud, Michel Poulin, Michel Morin, et al.. Performance of balanced detection in a coherent receiver [J]. Opt Express, 2009, 17(5): 3659-3672.

[3] Wang Chunhui, Gao Long, Pang Yajun, et al.. Experimental investigation for relation between beam splitter coefficient and signal-to-noise ratio of 2 μm balanced coherent system [J]. Acta Optica Sinica, 2011, 31(11): 1104002.

[4] Gao Long, Wang Chunhui, Li Yanchao, et al.. Investigation of balanced detection and receiver for 1.55 μm coherent wind lidar [J]. Acta Photonica Sinica, 2010, 39(6): 1064-1068.

[5] Matthias Seimeta, Carl-Michael Weinert. Options, feasibility and availability of 2×4 90° hybrid for coherent optical systems [J]. J Lightwave Technol, 2006, 24(3): 1317-1322.

[6] S H Jeong, K Morito. Optical 90° hybrid with broad operating bandwidth of 90 nm [J]. Opt Lett, 2009, 34(22): 3505-3507.

[7] Zhou Yu, Wan Lingyu, Zhi Yanan, et al.. Polarization-splitting 2×4 90° free space optical hybrid with phase compensation [J]. Acta Optica Sinica, 2009, 29(12): 3291-3294.

[8] Wan Lingyu, Su Shida, Liu Liren, et al.. Design of a new 90° 2×4 hybrid based on the birefringence and the electro-optic effect of crystal [J]. Chinese J Lasers, 2009, 36(9): 2358-2361.

[9] Hou Peipei, Zhou Yu, Zhi Yanan, et al.. Free space optical 2×4 90° hybrid based on crystal birefringence [J]. Acta Optica Sinica, 2010, 30(12): 3413-3416.

[10] Liu Hongzhan, Ji Yuefeng, Xu Nan, et al.. Effect of amplitude profile difference of signal and local oscillator wave on heterodyne efficiency in the inter-satellite coherent optical communication system [J]. Acta Optica Sinica, 2011, 31(10): 1006001.

[11] Ma Zongfeng, Zhang Chunxi, Zhang Zhaoyang, et al.. Signal-noise ratio in optical heterodyne detection [J]. Acta Optica Sinica, 2007,27(5): 889-891.