Optical transmission system, optical receiving-transmitting unit and coincidence frequency adjustment method of optical transmission system

Abstract

The invention discloses an optical transmission system, an optical receiving-transmitting unit and a coincidence frequency adjustment method of the optical transmission system. The optical receiving-transmitting unit is additionally provided with a handshake protocol processor and an optical power adjuster; a frequency mixer utilizes an optical signal of a laser as a local-oscillation optical signal; the handshake protocol processor is interacted with the corresponding optical receiving-transmitting unit on respective laser frequency-locking status signals and locks the frequency of the output optical signal of the laser according to the received laser frequency-locking status signal; and the optical power adjuster adjusts the output optical power of the laser according to the optical power of a received coincidence optical signal so that the optical power of the local-oscillation optical signal reaches an optimized value. According to the invention, a coordination mechanism between east and west optical receiving-transmitting units is established by adopting an OSC (Optical Supervisory Channel) or OTN (Optical Transmission Net) overhead mode, and the optical power output to the frequency mixer and a modulator is controlled by adopting an optical power adjusting unit so that only one laser is used for the optical receiving-transmitting unit, therefore the cost of a WDM (Wavelength Division Multiplexing) system and the size and power consumption of the optical receiving-transmitting unit are reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to an optical transmission system, an optical transceiver unit and a coherent frequency adjustment method thereof. Background technique [0002] The rapid growth of services such as mobile Internet, video, and broadband Internet access has brought enormous traffic pressure to operators' metropolitan area networks and backbone networks. In order to ensure user experience, operators must increase the capacity of the metropolitan area network and the backbone network, thereby promoting the deployment and development of ultra-high-speed WDM systems such as 40Gbit / s, 100Gbit / s, and even 400Gbit / s and 1Tbit / s. [0003] With the increase of the transmission rate of the WDM system, the development of transmission technology has also encountered higher challenges. In order to improve the spectral efficiency, suppress linear impairment, improve the OSNR tolerance and impro...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve the problem that in the WDM system, since the optical transceiver unit must be provided with two lasers, the cost of the WDM system is increased

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