US 12,353,033 B2
Pluggable optical module and optical communication system
Yuuji Minota, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Jan. 10, 2024, as Appl. No. 18/408,764.
Application 18/408,764 is a continuation of application No. 17/984,478, filed on Nov. 10, 2022, granted, now 11,906,797.
Application 17/984,478 is a continuation of application No. 17/573,753, filed on Jan. 12, 2022, granted, now 11,525,969, issued on Dec. 13, 2022.
Application 17/573,753 is a continuation of application No. 17/456,122, filed on Nov. 22, 2021, granted, now 11,668,885, issued on Jun. 6, 2023.
Application 17/456,122 is a continuation of application No. 16/700,583, filed on Dec. 2, 2019, granted, now 11,215,771, issued on Jan. 4, 2022.
Application 16/700,583 is a continuation of application No. 15/736,626, granted, now 10,502,909, issued on Dec. 10, 2019, previously published as PCT/JP2016/001939, filed on Apr. 7, 2016.
Claims priority of application No. 2015-120420 (JP), filed on Jun. 15, 2015.
Prior Publication US 2024/0142729 A1, May 2, 2024
Int. Cl. G02B 6/42 (2006.01); G02B 6/255 (2006.01); G02B 6/44 (2006.01); G02B 6/46 (2006.01); H04B 10/40 (2013.01)
CPC G02B 6/423 (2013.01) [G02B 6/255 (2013.01); G02B 6/42 (2013.01); G02B 6/4246 (2013.01); G02B 6/4249 (2013.01); G02B 6/4278 (2013.01); G02B 6/428 (2013.01); G02B 6/4292 (2013.01); G02B 6/4293 (2013.01); G02B 6/4454 (2013.01); G02B 6/4457 (2013.01); G02B 6/46 (2013.01); H04B 10/40 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A pluggable optical module comprising:
a pluggable electric connector configured to connect with an optical communication apparatus;
a pluggable optical receptor configured to connect with an outer optical fiber transmitting a first optical signal;
an optical output module configured to output a second optical signal and a local oscillation light;
an optical receiver configured to receive the first optical signal by interfering with the local oscillation light;
a first printed circuit board configured to connect with the optical receiver;
a first optical fiber configured to transmit the first optical signal;
a second optical fiber configured to transmit the local oscillation light;
a third optical fiber configured to transmit the second optical signal;
a guide configured to wind the first optical fiber, the second optical fiber and the third optical fiber; and
a second printed circuit board stacked with the first printed circuit board,
wherein the guide is partially located between the first printed circuit board and the second printed circuit board.