초록 ▼

The present invention aims at providing optical multiplexing/demultiplexing apparatus and method, in which an optical power balance of each wavelength light of a wavelength division multiplexed signal light at input and output ports thereof can be maintained. Thus, an optical multiplexing/demultiple

The present invention aims at providing optical multiplexing/demultiplexing apparatus and method, in which an optical power balance of each wavelength light of a wavelength division multiplexed signal light at input and output ports thereof can be maintained. Thus, an optical multiplexing/demultiplexing apparatus of the present invention has a basic constitution consisting of: an OADM circuit for branching a signal light of a specific wavelength from a wavelength-division-multiplexed signal light sent from a main optical fiber, and for inserting a signal light of a specific wavelength into the wavelength-division-multiplexed signal light sent from a main optical fiber; and an add-light power control portion for controlling the optical power of add light added in the OADM circuit based on a drop light branched in the OADM circuit. In the add-light power control portion, the optical power of each of drop light and add light is measured to perform a control operation of controlling the ratio between the optical power of the drop light and the optical power of the add light to be constant. Consequently, the optical power of signal light of each wavelength at input and output ports of the optical multiplexing/demultiplexing apparatus can be maintained at a constant level.

대표청구항 ▼

The present invention aims at providing optical multiplexing/demultiplexing apparatus and method, in which an optical power balance of each wavelength light of a wavelength division multiplexed signal light at input and output ports thereof can be maintained. Thus, an optical multiplexing/demultiple

The present invention aims at providing optical multiplexing/demultiplexing apparatus and method, in which an optical power balance of each wavelength light of a wavelength division multiplexed signal light at input and output ports thereof can be maintained. Thus, an optical multiplexing/demultiplexing apparatus of the present invention has a basic constitution consisting of: an OADM circuit for branching a signal light of a specific wavelength from a wavelength-division-multiplexed signal light sent from a main optical fiber, and for inserting a signal light of a specific wavelength into the wavelength-division-multiplexed signal light sent from a main optical fiber; and an add-light power control portion for controlling the optical power of add light added in the OADM circuit based on a drop light branched in the OADM circuit. In the add-light power control portion, the optical power of each of drop light and add light is measured to perform a control operation of controlling the ratio between the optical power of the drop light and the optical power of the add light to be constant. Consequently, the optical power of signal light of each wavelength at input and output ports of the optical multiplexing/demultiplexing apparatus can be maintained at a constant level. ed. According to one aspect of the present invention final status associated with a presentation job (e.g., a fax job or a print job) is made available to an output server. One or more host processing threads or processes are spawned for each new presentation job received by the output server. Then, the presentation job is submitted to a presentation device for which the presentation job is destined by way of an instance of a wrapper process that is capable of communicating bi-directionally with the presentation device. After submitting the presentation job, a host job status thread or process waits for status pertaining to the presentation job. Ultimately, a final status associated with the presentation job is received by the wrapper process and the wrapper process reports the final status to the host job status thread or process. According to another aspect of the present invention, job and device status may be reported asynchronously. One or more host processing threads or processes are spawned for each new presentation job received. A first presentation job is submitted to a presentation device for which the presentation job is destined by way of a first instance of a wrapper process that communicates bi-directionally with the presentation device. Subsequently, a second presentation job is submitted to the presentation device by way of a second instance of the wrapper process. A first and second job status thread or process wait for status pertaining to the first and second presentation jobs, respectively. A final status associated with the second presentation job is received by the second instance of the wrapper before a final status associated with the first presentation job is received by the first instance of the wrapper. Then, the second instance of the wrapper process reports the final status to the second job status thread or process.