Dual laser control for point-to-multipoint networks using bi-directional transmission

Abstract

[Consistent with the present disclosure an apparatus and related method are provided for controlling the leaf-receiver local oscillator laser and leaf-transmitter laser for cases where separate transmit and receive local oscillator lasers are included in a transceiver. As a result, full capacity in bidirectional transmission can be realized on a single fiber. The leaf local oscillator frequency is controlled using a feedback signal generated based on an output from the leaf-digital signal processor (DSP), and the leaf transmit laser is controlled using a feedback signal based on an output of the remote hub-DSP, which is carried from the hub to the leaf nodes by a general communication channel (GCC) as part of a data signal, or a separate subcarrier also referred to as an auxiliary channel or out-of-band channel. This ensures that the frequencies transmitted subcarriers from the leaf nodes do not collide or overlap with one another in frequency.

Dependencies are inferred from the claim text.