APPARATUS OF ADJUSTING OPTICAL SIGNAL TRANSMISSION TIMING
0 Assignments
0 Petitions
Accused Products
Abstract
In a light reception element such as an APD (Avalanche Photo Diode) used for receiving a high-speed and weak optical signal, it is possible to prevent the phenomenon of distortion of a signal inputted after a large-level light is received. A PON (Passive Optical Network) system includes an OLT (Optical Line Terminal) which can impartially and effectively transmit light reception data to each ONU (Optical Network Unit). According to a light reception amplitude received by each ONU, an inter-frame gap of an appropriate length is assigned for each ONU. The OLT includes a unit for measuring and accumulating the reception light amplitude and data on the inter-frame gap of an appropriate length decided in advance according to the characteristic of the light reception device and generates a grant value for assuring an inter-frame gap of an appropriate length by using the both information.
-
Citations
19 Claims
-
1-12. -12. (canceled)
-
13. A station side communication device connected to a plurality of subscriber side communication devices via a light multiplex/demultiplex device and deciding an order of optical signal transmissions from the subscriber side communication devices and deciding and instructing a transmission start timing for starting transmission of an optical signal for each of the subscriber side communication devices, the station side communication device comprising:
-
an optical signal monitor unit which monitors powers of optical signals received from the subscriber side communication devices; a transmission time adjusting unit which, based on a power of an optical signal of a first of said subscriber side communication devices that is monitored by said optical signal monitor unit, decides as to how long a length of transmission interval is to be placed before a second of said subscriber side communication devices that will transmit an optical signal next after said first subscriber side communication device, starts to transmit the optical signal, after completion of optical signal transmission by said first subscriber side communication device; and a transmission permission unit which decides the transmission start timing of the second subscriber side communication device by using the transmission interval decided by the transmission time adjusting unit. - View Dependent Claims (14, 15, 16, 17, 18, 19)
-
Specification