OPTICAL TRANSCEIVER AND CONTROL METHOD

• US 20190312661A1
• Filed: 06/19/2017
• Published: 10/10/2019
• Est. Priority Date: 06/20/2016
• Status: Active Grant

• Current Assignee: Nippon Telegraph and Telephone Corporation
• Original Assignee: Nippon Telegraph and Telephone Corporation
• Inventors: TAGUCHI, Katsuhisa, ASAKA, Kota
• Granted Patent: US 10,594,431 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 10/40 Transceivers
• CPC Class Codes: H04B 10/508 Pulse generation, e.g. generation of solitons
• CPC Class Codes: H04B 10/572 Wavelength control
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/0246 using one wavelength per ONU
• CPC Class Codes: H04J 14/025 using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
• CPC Class Codes: H04J 14/0265 Multiplex arrangements in bidirectional systems, e.g. interleaved allocation of wavelengths or allocation of wavelength groups
• CPC Class Codes: H04J 14/0282 WDM tree architectures

Abstract

An optical transceiver includes a wavelength-tunable transmission unit configured to transmit an optical transmission signal, a wavelength-tunable reception unit configured to receive an optical reception signal, a wavelength table configured to store a plurality of combinations of a transmission wavelength and a reception wavelength, an input terminal configured to input a wavelength selection signal, and a control unit configured to select one combination of the transmission wavelength and the reception wavelength from the wavelength table based on the wavelength selection signal, and perform transmission wavelength control for setting the selected transmission wavelength in the wavelength-tunable transmission unit as a wavelength of the optical transmission signal and reception wavelength control for setting the selected reception wavelength in the wavelength-tunable reception unit as a wavelength of the optical reception signal.

Claims

1. An optical transceiver comprising:

a wavelength-tunable transmitter configured to transmit an optical transmission signal;

a wavelength-tunable receiver configured to receive an optical reception signal;

a wavelength table configured to store a plurality of combinations of a transmission wavelength and a reception wavelength;

an input terminal configured to input a wavelength selection signal; and

a controller configured to select one combination of the transmission wavelength and the reception wavelength from the wavelength table based on the wavelength selection signal, and perform transmission wavelength control for setting the selected transmission wavelength in the wavelength-tunable transmitter as a wavelength of the optical transmission signal and reception wavelength control for setting the selected reception wavelength in the wavelength-tunable receiver as a wavelength of the optical reception signal.

2. The optical transceiver according to claim 1,

wherein the wavelength selection signal is input to the input terminal as one or more of control pulses,

wherein the wavelength table stores each of the plurality of combinations correlated with a respective number of the control pulses, and

wherein the controller selects the one combination of the transmission wavelength and the reception wavelength, which corresponds to the number of the control pulses as the wavelength selection signal, from the wavelength table, and performs the transmission wavelength control and the reception wavelength control.

3. The optical transceiver according to claim 1,

wherein the wavelength selection signal is input to the input terminal as a control voltage of any one of a plurality of predetermined voltage values,

wherein the wavelength table stores each of the plurality of combinations correlated with a respective voltage value of the plurality of predetermined voltage values, and

wherein the controller selects the one combination of the transmission wavelength and the reception wavelength, which corresponds to the control voltage as the wavelength selection signal, from the wavelength table, and performs the transmission wavelength control and the reception wavelength control.

4. The optical transceiver according to claim 2,

wherein a transmission control signal determined by a voltage value corresponding to each of transmission and stoppage of the optical transmission signal is input to the input terminal, and

wherein the controller controls the transmission of the optical transmission signal by the wavelength-tunable transmitter in accordance with the transmission control signal.

5. The optical transceiver according to claim 2,

wherein a reset signal instructing initialization for the transmission wavelength and the reception wavelength is input to the input terminal as a predetermined voltage value or a predetermined number of control pulses, and

wherein the controller selects a predetermined combination of the transmission wavelength and the reception wavelength in accordance with the reset signal, and performs the transmission wavelength control and the reception wavelength control.

6. A control method in an optical transceiver including a wavelength-tunable transmitter that transmits an optical transmission signal, a wavelength-tunable receiver that receives an optical reception signal, a wavelength table that stores a plurality of combinations of a transmission wavelength and a reception wavelength, and an input terminal through which a wavelength selection signal is input, the control method comprising:

a step of selecting one combination of the transmission wavelength and the reception wavelength from the wavelength table based on the wavelength selection signal;

a step of setting the selected transmission wavelength in the wavelength-tunable transmitter as a wavelength of the optical transmission signal; and

a step of setting the selected reception wavelength in the wavelength-tunable receiver as a wavelength of the optical reception signal.