US 12,334,702 B2
Optical module and erbium-doped fiber amplifier
Hai-Feng Lv, Zhuhai (CN); Feng-Qing Zhou, Fremont, CA (US); Gui-Jun Ji, Cupertino, CA (US); Zhong-Sheng Wang, Zhuhai (CN); and Da-Xin Chen, Zhuhai (CN)
Assigned to Molex, LLC, Lisle, IL (US)
Appl. No. 16/636,641
Filed by Molex, LLC, Lisle, IL (US)
PCT Filed Aug. 10, 2018, PCT No. PCT/IB2018/056031
§ 371(c)(1), (2) Date Mar. 18, 2021,
PCT Pub. No. WO2019/030713, PCT Pub. Date Feb. 14, 2019.
Claims priority of application No. 201710685457.4 (CN), filed on Aug. 11, 2017.
Prior Publication US 2021/0210922 A1, Jul. 8, 2021
Int. Cl. H01S 3/067 (2006.01); H01S 3/00 (2006.01); H01S 3/094 (2006.01); H01S 3/10 (2006.01); H01S 3/13 (2006.01); H01S 3/16 (2006.01)
CPC H01S 3/06754 (2013.01) [H01S 3/0064 (2013.01); H01S 3/094003 (2013.01); H01S 3/10023 (2013.01); H01S 3/13013 (2019.08); H01S 3/1608 (2013.01); H01S 3/0071 (2013.01); H01S 3/094053 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical module for an erbium-doped fiber amplifier (EDFA) for amplifying optical signal, comprising:
an optical fiber component, comprising:
a first fiber, configured to input a signal light having a first wavelength;
a second fiber, configured to input a pump light having a second wavelength;
a third fiber, configured to output the pump light and the signal light together;
a fourth fiber, configured to input an amplified signal light which amplified from the signal light and to input a surplus of the pump light output by the third fiber; and
a fifth fiber, configured to output the amplified signal light;
a walk-off birefringent crystal adjacent to the optical fiber component;
a collimating lens adjacent to the walk-off birefringent crystal and opposite to the optical fiber component;
one or more first wave plates and a second wave plate provided between the walk-off birefringent crystal and the collimating lens, wherein the one or more first wave plates are aligned with the first fiber and the fourth fiber;
a Faraday rotator adjacent to the collimating lens and opposite to the walk-off birefringent crystal;
a wavelength division multiplexing (WDM) filter provided between the collimating lens and the Faraday rotator, the WDM filter passing the signal light and the amplified signal light, and reflecting the pump light;
a mirror adjacent to the Faraday rotator and opposite to the WDM filter, the mirror reflecting a major portion of the signal light and the amplified signal light; and
an optical detecting component adjacent to the mirror and opposite to the Faraday rotator;
wherein the optical fiber component, the walk-off birefringent crystal, the one or more first wave plates, the second wave plate, the collimating lens, the WDM filter, the Faraday rotator and the mirror are arranged and oriented with respect to each other so that the signal light input from the first fiber and the pump light input from the second fiber are reflected and coupled to the third fiber, the amplified signal light input from the fourth fiber is reflected and coupled to the fifth fiber, and the surplus of the pump light input from the fourth fiber is reflected by the WDM filter and dissipated to an environment of the EDFA; and
wherein the one or more first wave plates are aligned with the first fiber and the fourth fiber such that the signal light input from the first fiber and the amplified signal light input from the fourth fiber are transmitted through the one or more first wave plates before being reflected.