4 results about "Passive optical network" patented technology

The present invention discloses a host receiver synchronizer for passive optical networks, and in particular a burst clock data recovery circuit in a host receiver in a bursty asynchronous communication system having a non-data preamble of less than 250 ns, for recovering a clock signal from a subscriber data burst. The circuit comprises: an adjustable oscillator for generating an output clock signal in response to a signal at an input thereof; a first comparator for comparing a frequency and phase of the output clock signal to that of a reference signal and feeding back a first feedback signal to the oscillator input; and a second comparator for comparing the frequency and phase of the output clock signal to that of the data burst and feeding back a second feedback signal to the oscillator input once the output clock signal is locked in frequency with the reference signal. The output clock signal is locked in frequency and phase to the data burst before receipt of the last bit of the preamble. The present invention is advantageous in that the receiver circuit improves synchronized jitter performance over the prior art solutions so that additional timing margin is provided, thereby allowing longer fiber lengths to be supported.

The invention discloses an optical module and a passive optical network with the same. The optical module comprises a master control unit, an optical emitting component integrate with a temperature controller, a temperature controller driving unit and a wavelength tuning unit. By the wavelength tuning unit and the temperature controller driving unit in the optical module, the emitting wavelength of the optical module can be conveniently adjusted by the master control unit of the optical module, wavelength adjustment manner is simple, and difficulty and cost for building the network by optical modules are reduced.

The invention discloses a spectrum defragmentation trigger method based on spectrum sensing in an elastic optical network. The spectrum defragmentation trigger method comprises the following steps that step (1): the spectrum availability before defragmentation and the business demand degree are calculated; step (2): the spectrum availability before defragmentation and the business demand degree are compared, and spectrum defragmentation is not required when the spectrum availability before defragmentation is greater than or equal to the business demand degree; and the spectrum availability after defragmentation is calculated when the spectrum availability before defragmentation is less than the business demand degree, and the step (3) is performed; and step (3): the spectrum availability after defragmentation is compared with the business demand degree, and the spectrum defragmentation mechanism is triggered when the spectrum availability after defragmentation is greater than or equalto the business demand degree; and spectrum defragmentation is not required when the spectrum availability after defragmentation is less than the business demand degree. The spectrum defragmentation trigger method has the advantages of increasing the success rate of network business transmission, reducing network business blocking rate and enhancing the network resource utilization efficiency.

The invention discloses a plastic optical fiber collection system, which comprises a light module, a passive optical network chip, a network transformer and a socket, wherein the light module, the passive optical network chip, the network transformer and the socket are sequentially connected; the passive optical network chip is sequentially connected with a reset chip, a level conversion chip and a serial signal socket. When the optical fiber collection system is used, the real-time inquiry can be realized; the requirements of electric power remote meter checking and the like can be met; the efficiency is high.