Coherent optical code division multiple access (OCDMA) technique, where encoding and decoding are based on the
phase and amplitude of optical field instead of its intensity, is receiving much attention for the overall superior
performance over incoherent OCDMA and the development of compact and reliable en/decoders (E/D) such as spatial
light phase modulator (SLPM), superstructured fiber Bragg grating (SSFBG) and multi-port array waveguide grating
(AWG)-type E/D. In this paper, we will discuss several recent progresses in coherent OCDMA: a. Novel coding
technology such as multi-phase-level SSFBG encoder, 50x50 multiport en/decoder and reconfigurable time domain
spectral phase en/decoding; b. New signal modulation formats in OCDMA including DPSK, DQPSK, CSK and M-ary
CSK; and c. Field trials of high capacity WDM/OCDMA systems.