Optical module
An integrated apparatus with optical/electrical interfaces and protocol converter on a single silicon substrate. The apparatus includes an optical module comprising one or more modulators respectively coupled with one or more laser devices for producing a first optical signal to an optical interface and one or more photodetectors for detecting a second optical signal from the optical interface to generate a current signal. Additionally, the apparatus includes a transmit lane module coupled between the optical module and an electrical interface to receive a first electric signal from the electrical interface and provide a framing protocol for driving the one or more modulators. Furthermore, the apparatus includes a receive lane module coupled between the optical module and the electrical interface to process the current signal to send a second electric signal to the electrical interface.
1. An integrated communication apparatus for 100 Gb/s data rate system comprising:
a DMUX device configured to interleave an incoming optical signal from a single fiber to two lights respectively with two channel wavelengths;
a dual PIN photodetector for separately detecting the two lights and respectively convert to two current signals;
a receive lane module comprising a dual linear TIA and dual PAM-enabled ADC/DSP device for processing the two current signals and generating corresponding digital signals;
a transmit lane module comprising a dual PAM driver and a forward error correction device (FEC) to handle electrical signals received from an electrical interface;
two DFB laser devices for producing two laser signals with two wavelengths based on the electrical signals, the DFB laser devices being characterized by a relative intensity noise (RIN) level of less than −140 dB/Hz;
a dual optical modulator comprising a PAM encoder driven by the dual PAM driver to modulate the two laser signals to generate two modulated optical signals; and
a MUX device configured to combine the two modulated optical signals to one output signal into an output fiber;
wherein the transmit lane module further comprises a Rx correct data recovery (Rx-CDR) device and a forward error correction (FEC) device coupled with an encoder to handle the electrical signal from the Ethernet; the receive lane module further comprises a forward error correction (FEC) device coupled with an decoder and Tx correct data recovery (Tx-CDR) device to remove jitter within the digital signals to be sent to the Ethernet.
2. The integrated communication apparatus of claim 1 wherein the electrical interface comprises an Ethernet configured to provide an electrical signal in 4×25 G CAUI-4 format.
3. The integrated communication apparatus of claim 1 wherein the dual PAM driver is implemented with an encoder in 28.125 GBaud PAM4 format for 100 Gbit/s data rate optical transmission over one of 4 CWDM channels or 40 DWDM channels with 100 GHz spacing.