An apparatus and method for maintaining a wavelength interval of light sources are disclosed. The apparatus for maintaining a wavelength interval of light sources includes: a plurality of light sources configured to output light having different wavelengths and having a certain wavelength interval; a light reception unit configured to receive an optical signal in which at least some of the output light of each of the plurality of light sources is combined and output an electrical signal including a frequency component corresponding to the certain wavelength interval; and a controller configured to detect the frequency component corresponding to the certain wavelength interval from the electrical signal and control a wavelength of each of the plurality of light sources to maintain the certain wavelength interval based on the detected frequency component.

An optical transceiver of the present invention includes a coexistence element therein. An optical signal according to a first standard and an optical signal according to a second standard are transmitted and received through an optical cable accommodated in a first receptacle of the optical transceiver, and in the coexistence element, the optical signal according to the first standard and the optical signal according to the second standard are divided/combined. Among the divided upstream optical signals, the optical signal according to the first standard is photoelectrically converted in the optical transceiver, and the optical signal according to the second standard is transmitted to the outside through an optical cable accommodated in a second receptacle.

An photonic circuit includes a substrate, a plurality of first light waveguides disposed on the substrate, the first light waveguides extending in a first direction, a plurality of second light waveguides disposed on the substrate and extending in a second direction intersecting the first direction, and a plurality of first micro-ring resonators disposed on the substrate. Each of the first light waveguides has an intersection with each of the second light waveguides. Each of the intersections is provided with a first micro-ring resonator of the first micro-ring resonators. Each first micro-ring resonator is configured to route signals of a respective wavelength from one of the light waveguides at the intersection to another light waveguide at the intersection.

An optical data communication system includes an optical power supply and an electro-optical chip. The optical power supply includes a laser that generates laser light at a single wavelength. A comb generator receives the light at the single wavelength and generates multiple wavelengths of continuous wave light from laser light at the single wavelength. The multiple wavelengths of continuous wave light are provided as light input to the electro-optical chip. The electro-optical chip includes at least one transmit macro that receives the multiple wavelengths of continuous wave light and that modulates one or more of the multiple wavelengths of continuous wave light to generate modulated light signals that convey digital data.

A system and a method of dynamic bandwidth allocation in the passive optical network comprising a SDN controller (112) to switch a first subscriber of the subscriber group (102) from a first passive optical network (PON) port to a second PON port at the OLT (116) when a first bandwidth availability at the first PON port is less than a predefined bandwidth and a second bandwidth availability at the second PON port is more than the predefined bandwidth. In particular, the predefined bandwidth is a required bandwidth by the first subscriber.

Disclosed herein is wavelength-division multiplexing (WDM) and demultiplexing with signal entry and exit in a common routing surface to increase channel density. In particular, disclosed is a WDM assembly including a plurality of common ports and a plurality of channel sets having one or more channel ports. The WDM assembly includes a first routing surface with a first WDM passband and a second routing surface offset from the first routing surface. The second routing surface is configured to reflect at least one signal passed through the first routing surface back through the first routing surface at a laterally different location. Optical signal paths of at least a portion of the common ports are parallel to and offset from one another. In certain embodiments, such a configuration may increase channel density and decrease a form factor (e.g., footprint).

An optical data communication system includes an optical power supply and an electro-optical chip. The optical power supply includes a laser that generates laser light at a single wavelength. A comb generator receives the light at the single wavelength and generates multiple wavelengths of continuous wave light from laser light at the single wavelength. The multiple wavelengths of continuous wave light are provided as light input to the electro-optical chip. The electro-optical chip includes at least one transmit macro that receives the multiple wavelengths of continuous wave light and that modulates one or more of the multiple wavelengths of continuous wave light to generate modulated light signals that convey digital data.

An optical line terminal (OLT) includes: a first optical transceiver and a second optical transceiver each configured to transmit or receive at least one optical signal among an optical signal of a first standard and an optical signal of a second standard through an optical cable inserted thereinto, and convert between an optical signal and an electrical signal; a first connector configured to electrically connect an extended output terminal of an electrical signal input/output unit of the first transceiver and an extended output terminal of an electrical signal input/output unit of the second optical transceiver; and a second connector configured to selectively connect the extended output terminal and a default output terminal of the electrical signal input/output unit of the second optical transceiver.

An photonic circuit includes a substrate, a plurality of first light waveguides disposed on the substrate, the first light waveguides extending in a first direction, a plurality of second light waveguides disposed on the substrate and extending in a second direction intersecting the first direction, and a plurality of first micro-ring resonators disposed on the substrate. Each of the first light waveguides has an intersection with each of the second light waveguides. Each of the intersections is provided with a first micro-ring resonator of the first micro-ring resonators. Each first micro-ring resonator is configured to route signals of a respective wavelength from one of the light waveguides at the intersection to another light waveguide at the intersection.

An optical line terminal (OLT) includes: a first optical transceiver and a second optical transceiver each configured to transmit or receive at least one optical signal among an optical signal of a first standard and an optical signal of a second standard through an optical cable inserted thereinto, and convert between an optical signal and an electrical signal; a first connector configured to electrically connect an extended output terminal of an electrical signal input/output unit of the first transceiver and an extended output terminal of an electrical signal input/output unit of the second optical transceiver; and a second connector configured to selectively connect the extended output terminal and a default output terminal of the electrical signal input/output unit of the second optical transceiver.