Off quadrature biasing of Mach Zehnder modulator for improved OSNR performance

摘要

An integrated optical modulator device. The device can include a driver module coupled to an optical modulator. The optical modulator is characterized by a raised cosine transfer function. This optical modulator can be coupled to a light source and a bias control module, which is configured to apply an off-quadrature bias to the optical modulator. This bias can be accomplished by applying an inverse of the modulator transfer function to the optical modulator in order to minimize a noise variance. This compression function can result in an optimized increased top eye opening for a signal associated with the optical modulator. Furthermore, the optical modulator can be coupled to an EDFA (Erbium Doped Fiber Amplifier) that is coupled to a filter coupled an O/E (Optical-to-Electrical) receiver.

主权项

1. A method for processing optical signal, the method comprising:
receiving an incoming signal; generating a driving signal based on the incoming signal; receiving a light from a light source; generating a bias signal for minimizing a noise variance that is proportional to 2√{square root over (nΔPASE)}, wherein nΔ is a signal level n and PASE is an Amplified Spontaneous Emission Power; modulating the light to generate a light signal using the bias signal and a raised sine transfer function; amplifying the light signal; and filtering the amplified light signal.