Wavelength-tunable pluggable optical module, optical communication system and wavelength change method of wavelength-tunable pluggable optical module

Abstract

A pluggable electric connector can communicate a communication data signal and a control signal with an optical communication device. An optical signal output unit is configured to be capable of selectively output a wavelength of an optical signal. An optical power adjustment unit can adjust optical power of the optical signal. A pluggable optical receptor can output the optical signal to an optical fiber. A control unit controls a wavelength change operation according to the control signal. The control unit, according to a wavelength change command, commands the optical power adjustment unit to block output of the optical signal, commands the light signal output unit to change the wavelength of the optical signal after the optical signal is blocked, and commands the light signal output unit and the optical power adjustment unit to output the optical signal after the wavelength change operation.

1 . A pluggable optical module comprising:
 an electrical connector configured to connect with a host communication apparatus;   an optical connector receptacle configured to connect an optical fiber with an optical fiber connector;   a wavelength tunable light source configured to output a light;   a modulator configured to modulate the output light based on an electric signal from the host communication apparatus via the electrical connector and output an optical signal;   an optical attenuator configured to attenuate the optical signal; and   a processor configured to control a wavelength change operation in response to a wavelength change command from the host communication apparatus via the electrical connector, wherein   the wavelength change operation comprises:
 the optical attenuator increases an attenuation of optical signal; 
 the wavelength tunable light source changes a wavelength of the light after the optical attenuator increases the attenuation; 
 the processor informs a wavelength change completion to the host communication apparatus after the wavelength tunable light source changes the wavelength of the light; and 
 the optical attenuator decreases the attenuation in response to an indication from the host communication apparatus after the processor informs the wavelength change completion.