We propose a concept of wavelength synchronization to ensure the stability of ultra-dense channels in an ultra-dense wavelength division multiplexing passive optical network(UDWDM-PON)transmitter.A mode-locked laser i...We propose a concept of wavelength synchronization to ensure the stability of ultra-dense channels in an ultra-dense wavelength division multiplexing passive optical network(UDWDM-PON)transmitter.A mode-locked laser is used to provide wavelength references for users.By injection locking the semiconductor laser,the separation of the wavelength reference is realized in an optical line terminal.The downlink and uplink wavelength references are interlaced and distributed to facilitate the synchronization of uplink carriers.In the optical network unit,the uplink optical carriers are filtered by injection locking semiconductor lasers,which achieve wavelength synchronization for the uplink users.In this Letter,an adaptive wavelength synchronization transmitter for UDWDM-PON is realized with a channel spacing of 5 GHz.展开更多
As microsatellite technology develops,precise inter-satellite measurement shows its significance in distributed satellite systems.In this Letter,a novel technique is proposed for measuring the inter-satellite distance...As microsatellite technology develops,precise inter-satellite measurement shows its significance in distributed satellite systems.In this Letter,a novel technique is proposed for measuring the inter-satellite distance,which adopts optoelectronic resonance and has a function of self-referencing.Resonance cavities have a high spectral purity and a high oscillation frequency.By utilizing the accumulative amplification principle to convert the measurement of distance to that of the frequency,high accuracy is achieved.In the experiment,this measuring scheme has a large measuring range between 1 and 6 km（can be potentially larger）,and the accuracy is better than 1.5 urn.The relative accuracy reaches the level of 10^-10.展开更多
基金supported in part by the National Natural Science Foundation of China(NSFC)(Nos.61775162 and 61427817)。
文摘We propose a concept of wavelength synchronization to ensure the stability of ultra-dense channels in an ultra-dense wavelength division multiplexing passive optical network(UDWDM-PON)transmitter.A mode-locked laser is used to provide wavelength references for users.By injection locking the semiconductor laser,the separation of the wavelength reference is realized in an optical line terminal.The downlink and uplink wavelength references are interlaced and distributed to facilitate the synchronization of uplink carriers.In the optical network unit,the uplink optical carriers are filtered by injection locking semiconductor lasers,which achieve wavelength synchronization for the uplink users.In this Letter,an adaptive wavelength synchronization transmitter for UDWDM-PON is realized with a channel spacing of 5 GHz.
基金supported in part by the Chinese National Natural Science Foundation(Nos.61427817 and61405142)the Independent Innovation Fund of Tianjin University(No.1601)
文摘As microsatellite technology develops,precise inter-satellite measurement shows its significance in distributed satellite systems.In this Letter,a novel technique is proposed for measuring the inter-satellite distance,which adopts optoelectronic resonance and has a function of self-referencing.Resonance cavities have a high spectral purity and a high oscillation frequency.By utilizing the accumulative amplification principle to convert the measurement of distance to that of the frequency,high accuracy is achieved.In the experiment,this measuring scheme has a large measuring range between 1 and 6 km（can be potentially larger）,and the accuracy is better than 1.5 urn.The relative accuracy reaches the level of 10^-10.
