Optical communication system and method, optical module, and apparatus used in optical module

An optical communication system, comprising:

• N optical modules at a local end, each optical module in the N optical modules at the local end comprising a first optical interface and a second optical interface;
• the first optical interface of a first optical module in the N optical modules at the local end is connected to a peer end through an optical fiber link;
• and
• the second optical interface of an ith optical module in the N optical modules at the local end is connected to a first optical interface of an (i+1)th optical module in the N optical modules at the local end, where i=1, 2 . . . , N−1;
• wherein each optical module in the N optical modules at the local end is connected to a fronthaul interface at the local end;
• the first optical module in the N optical modules at the local end is configured to:
• convert, into an optical signal of a first wavelength, an electrical signal input from a fronthaul interface connected to the first optical module, output the optical signal to the peer end through the first optical interface of the first optical module, and output, to the peer end through the first optical interface of the first optical module, an optical signal input from a first optical interface of a second optical module to a second optical interface of the first optical module;
• and
• convert, into an electrical signal, an optical signal of an (N+1)th wavelength input from the peer end to the first optical interface of the first optical module, output the electrical signal to the fronthaul interface connected to the first optical module, and output, to the first optical interface of the second optical module through the second optical interface of the first optical module, an optical signal of another wavelength input from the peer end to the first optical interface of the first optical module;
• a jth optical module in the N optical modules at the local end is configured to:
• convert, into an optical signal of a jth wavelength, an electrical signal input from a fronthaul interface connected to the jth optical module, output the optical signal to a second optical interface of a (j−1)th optical module through a first optical interface of the jth optical module, and output, to the second optical interface of the (j−1)th optical module through the first optical interface of the jth optical module, an optical signal input from a first optical interface of a (j+1)th optical module to a second optical interface of the jth optical module;
• and
• convert, into an electrical signal, an optical signal of a (j+N)th wavelength input from a first optical interface of the (j−1)th optical module to the first optical interface of the jth optical module, output the electrical signal to the fronthaul interface connected to the jth optical module, and output, to the first optical interface of the (j+1)th optical module through the second optical interface of the jth optical module, an optical signal of another wavelength input from the first optical interface of the (j−1)th optical module to the first optical interface of the jth optical module, wherein j=2, 3, . . . , N−1;
• and
• an Nth optical module in the N optical modules at the local end is configured to:
• convert, into an optical signal of an Nth wavelength, an electrical signal input from a fronthaul interface connected to the Nth optical module, and output the optical signal to a second optical interface of an (N−1)th optical module through a first optical interface of the Nth optical module;
• and
• convert, into an electrical signal, an optical signal of a 2Nth wavelength input to the first optical interface of the Nth optical module, and output the electrical signal to the fronthaul interface connected to the Nth optical module;
• wherein a kth optical module in the N optical modules at the local end comprises:
• a transmitting unit, a first optical unit, a second optical unit, and a receiving unit, wherein the transmitting unit, the first optical interface, and the second optical unit are all coupled to the first optical unit, the receiving unit and the second optical interface are both coupled to the second optical unit, and k=1, 2, . . . , N;
• the transmitting unit is configured to convert, into an optical signal of a kth wavelength, an electrical signal input from a fronthaul interface connected to the kth optical module, and transmit a first optical signal to the first optical interface;
• in a case that k≠N,
• the first optical unit is configured to forward, to the first optical interface, the optical signal of the kth wavelength received from the transmitting unit, forward, to the first optical interface, an optical signal of a (k+1)th wavelength to the Nth wavelength received from the second optical unit, and forward, to the second optical unit, an optical signal of a (k+N)th wavelength to the 2Nth wavelength received from the first optical interface;
• the second optical unit is configured to forward, to the first optical unit, the optical signal of the (k+1)th wavelength to the Nth wavelength received from the second optical interface, forward, to the receiving unit, an optical signal of the (k+N)th wavelength received from the first optical unit, and forward, to the second optical interface, an optical signal of a (k+N+1)th wavelength to the 2Nth wavelength received from the first optical unit;
• and
• the receiving unit is configured to receive the optical signal of the (k+N)th wavelength from the second optical unit, convert the optical signal into an electrical signal, and output the electrical signal to the fronthaul interface connected to the kth optical module;
• and
• in a case that k=N,
• the first optical unit is configured to forward, to the first optical interface, the optical signal of the kth wavelength received from the transmitting unit, and forward, to the second optical unit, an optical signal of a 2kth wavelength received from the first optical interface;
• the second optical unit is configured to forward, to the receiving unit, the optical signal of the 2kth wavelength received from the first optical unit;
• and
• the receiving unit is configured to receive the optical signal of the 2kth wavelength from the second optical unit, convert the optical signal into an electrical signal, and output the electrical signal to the fronthaul interface connected to the kth optical module.